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Dumb and Dumber (1994) Poster

Goofs

Continuity 

After Nicholas tries to stop Harry and Lloyd from entering the ball and Lloyd sprays Binaca in his eyes, J.P. Shay stands next to him and says that they are the guys who "whacked Mental". The next scene Nicholas is on the stage with the snow owls, but then is instantly off stage and back at the entrance of the room with Shay again.
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This goof item contains spoilers. Click to view

Audio/visual unsynchronised 

When Lloyd is running up to the screens that tells the different flights on it, while he tries to find the flight for Aspen while saying eeny, meeny, miny, mo, he says "mo," but his lips don't move when he says it.
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When Harry and Lloyd are at home, Harry opens a beer and throws the bottle cap on the floor. It makes the sound of hitting a hardwood/tile floor even though all shots of the living room floor show it to be wall to wall carpet.
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The Mexican hitchhiker's guitar playing doesn't match the playing that's heard. Also you can see him stop playing in the middle of the singalong while it audibly continues.
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After the dinner scam, Lloyd tells Harry about the movie he saw. When he mentions the guy getting his throat slit, you can hear Harry speeding the car up, however the background outside does not move any faster.
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Character error 

When Lloyd tells Nicholas about the IOUs in the briefcase, he grabs one and says that it's worth $275,000 when it clearly says $875,000.
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The officers at the scene of Mental's death report that Harry and Lloyd were last seen headed west on I-80 towards Colorado. I-80 does not go through Colorado at any point; it passes north of the state through Nebraska and Wyoming.
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Mental clearly believes they Lloyd and Harry have been following him for weeks due to being called "gas man", however, he doesn't disguise himself for the hitchhiking scene.
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Continuity 

At the beginning of the movie, Harry's van has bucket seats, yet later on when the "gas-man" rides along, he is sitting on a bench seat in-between Harry and Lloyd.
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When Lloyd tackles Mary on the hotel stairs, she is wearing black pantyhose. By the time they get to the hotel room, she has mysteriously changed into gray tights.
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Harry and Lloyd drive over the same bridge twice on their way to Aspen.
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In the bar, Lloyd grabs the bartender with one hand but the next shot shows him grabbing him with the other hand.
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When Lloyd states that the map says they've only driven about four inches, there's a creek with an unusual tree growing around it. We see the same creek and tree when Harry and Lloyd pick up the "gas man."
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When Lloyd and Harry get stopped for speeding, Harry rolls the window down, even though it was already opened in shots from a moment before.
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When Lloyd drops Mary off at the airport and hugs her goodbye, in the background there are two men walking towards them. The camera changes to the angle behind Mary then behind Lloyd and then back to the side. When it returns to the side view the two men are farther away but still walking toward them.
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When Lloyd sees Mary's photo in the newspaper, he struggles to read the headline; he cannot even decipher the word "the" without Harry's help. However, in other scenes he can read perfectly (such as when he reads the graffiti in the men's room or the newspaper clipping in the bar).
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When Lloyd is trying on tuxedos, in the shot from the back of Harry's head you see a short cigar in his mouth. In the next shot from behind (when he stands up), the cigar gets bigger.
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When Harry has his tongue stuck to the chairlift, there is frost on the pole when he licks it. Later, when he asks the kids for a cup of warm water, there is none. Then when Mary removes his tongue, the frost is back.
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When Lloyd is in the gas station bathroom and first sees the "For Manly Love" writing on the wall, it says "BE HERE MARCH 25TH AT 2:15AM SHARP". All other shots of the writing say "MEET ME HERE ON MARCH 28 AT 2:15AM SHARP!".
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When Harry and Lloyd are sitting in their apartment, there is a beer cap in the middle of the floor after Larry threw it. In the next shot, it is closer to the couch than the previous shot.
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The Cadillac limo Lloyd is driving at the beginning is from the early 1980s and would have no airbag. The steering wheel is obviously not equipped with one in the shots either. After Lloyd drops off Mary at the airport, he gets back in the car and the wheel has been swapped with an airbag-style one for the scene where it deploys (with an inflated garbage bag of some sort).
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In the restaurant, Lloyd's fork is present/absent between shots.
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After shooting Harry, Nicholas' gun has the slide locked back, indicating that it is empty. In the next shot the slide is forward again.
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When Harry and Lloyd first arrive at the truck stop, a man with a white hat leaves the diner after the eighteen wheeler passes by. After Sea-Bass spits in Harry's burger, the same man is about to exit again
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When Lloyd drops Mary off at the airport, the interior of the car is different once Lloyd gets back in.
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When Lloyd tells Harry to throw some salt over his right shoulder, he puts the salt shaker next to Harry's burger and fries. The next shot shows the salt shaker behind the basket of Harry's food.
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When Lloyd is sleeping on Harry's shoulder in the van, it seems his head on the left side is leaning on Harry and messes up his hair. When they stop at the gas station, Lloyd's hair is messed up on the right side when he is in the bathroom.
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When Lloyd falls off the runway, the Asian man has a smile on his face. You can see it in the glass. But when the camera's on the man's face his expression is wincing.
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After they are both fired, the bottle cap that Lloyd tosses on the floor moves about between shots.
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When Harry and Lloyd get pulled over the road are separated yellow lines and when they are actually pulled over the median turns into two solid yellow lines.
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In the bar scene between Beth and Lloyd, Beth's sweater suddenly changes from buttoned up to wrapped around her shoulders.
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Right after Lloyd runs into the jetway at the airport, the guy who witnesses his fall moves to the window to watch. He is grinning from ear to ear in his reflection, but immediately has a 'that had to hurt' look in the next shot.
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In the scene when Harry stops and says to Lloyd,"look at the butt on that", there is a man with a blue coat that walks behind them into a store. When Harry and Lloyd turn around to keep walking, you can see the blue coat man entering the store once again. You may have to freeze frame it to see the man the second time.
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During the snowball fight it is snowing/not snowing between shots.
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When Lloyd drives Mary to the airport, he is in a car with no airbag. Afterward, we see an airbag deploy when he hits a car.
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When Lloyd encounters the "sweet old lady on the motorized cart", his wallet, which had been left inside the newspaper vending machine, disappears between shots.
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When Lloyd, Harry and the "gas man" stop at Dante's restaurant, the water jug on the left on the bar moves between shots.
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At the Preservation Society Party, the wine in Helen's glass changes from near empty to near full.
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After the guys get home from being fired and then crack a beer, there is a phone book keeping the couch Harry is sitting on level. In the next scene the phone book disappears.
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When Harry and Lloyd are in their hotel rooming talking about meeting Mary at 10PM instead of AM, Harry starts walking out of the room. He stops and turns to look at Lloyd and says, "10AM..". As he says this there is clearly a wall right next to him. When the picture pans out to show Lloyd and Harry, there is no wall remotely close to Harry.
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After Harry and Lloyd start gagging over the atomic peppers, we see a brief shot in which everyone else in the restaurant looks at them (and the waitress suddenly appears in that shot as well). But in very the next shot (back to Harry and Lloyd, still gagging), nobody is looking at them (and the waitress, who was there just a moment ago, disappears).
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When Harry and Lloyd are leaving Providence, in the first shot of the highway we see them driving on Route 146. In the next shot showing the Highway, they are driving on Route 95 South. There is no way they can be driving on both highways at the same time, and, if they could, they would be driving in opposite directions at the same time.
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When Harry and Lloyd go to the preservation dinner, Nicholas is standing by the front door. A few minutes later, he is up on the stage starting the presentation and introducing Mr. Swanson. Then instantly, he is back by the front door talking to his comrade. There is no way Nicholas could have done what he did in so little time - he doesn't look out of breath -- and without being seen.
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After Mary removes Harry's tongue from the pole her ski out fit is blue when before that it was black.
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When Lloyd is peeing in the beer bottles, he hands them to Harry... it shows him holding the bottles... next shot, he isn't holding them, and the shot after that, he is holding them again.
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During the diner sequence, the amount of fries in Harry's basket changes between shots.
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In the scene where Lloyd is making drinks for him and Harry, there is a half full bottle with something that looks like whiskey in it. Then the cameras changes angle to Harry for 2 seconds, and then again back to Lloyd, but suddenly there isn't half as much "whiskey" in the bottle as before. It is impossible that Lloyd could have poured so much "whiskey" into the glasses in only 2 seconds.
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When Lloyd and Harry are in the restaurant notice Lloyd's fork. In the side shot there is no fork, but when it changes to a front shot the fork appears. This happens several times throughout the scene.
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The film appears to begin in the summer. Look at the outside shots in Rhode Island when either Harry or Lloyd are driving; green grass and many leaves on the trees. As they travel further west the landscape appears to be fall. Then finally in Colorado it appears to be the dead of winter.
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When Lloyd is swinging his arms in the van, pretending to be 'running at an incredible rate', they are driving through a countryside with nothing but open plains. In the next shot, when Lloyd says 'we're really doing it though aren't we buddy?', look outside the passenger window. They are suddenly driving past houses in a residential area.
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When Harry and Lloyd are at the truck stop, there is a man sitting behind Lloyd. In the shots of Harry only, he is leaning towards the window, in the shots of Lloyd only, he is sitting up straight.
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When they have left the cafe without paying, and Lloyd has to pee, Harry's hair is blowing in one shot because the window is down and in the next shot the window is up and his hair is not blowing. This goes back and forth for the duration of the scene.
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When Nicholas Andre shoots Harry twice in the chest, the gun is empty after the two shots. The camera then moves to Harry getting up and shooting back. When the camera returns to Nicholas, the gun is not empty.
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When Lloyd is driving Mary to the airport, at one point he says "What's the matter, nervous about the flight?" When he says this look at the white van in the rear window, it's right up next to the limo. However when the shot cuts to Mary it's already several meters behind them despite the very slow movement the limo has made.
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When Harry delivers the dogs, there is no carpet on the floor in the car. But when the indians are sitting in the car suddenly there is a carpet on the floor.
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When Lloyd tells Harry to throw some salt over his right shoulder, he puts the salt shaker next to Harry's burger and fries. The next shot shows the salt shaker behind the basket of Harry's food.
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When Sea Bass demands to know who hit him with a salt shaker in the diner, we cut back to Harry and Lloyd's table and Lloyd begins pointing at Harry. When the camera angle changes, Harry turns around and Lloyd begins pointing a second time.
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When Harry has his tongue stuck to the chairlift, there is frost on the pole when he licks it. Later, when he asks the kids for a cup of warm water, there is none. Then when Mary removes his tongue, the frost is back.
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When the policeman is driving next to Harry and Lloyd's van telling them to pull over after their encounter with Sea Bass, the lines on the road are single broken lines. After they pull over, the police man walks over to the van and the road lines are double solid.
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When Mary leaves her briefcase on the airport floor, Jim Carrey is seen running and sliding to the briefcase. In the scene directly preceding that, he is nowhere to be seen, yet instantly he is teleported within 20 feet of the briefcase.
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In the scene at the truck stop, just before C-Bass comes over to Jim Carrey and Jeff Daniel's table, the same teenage boy walks by the window twice with his girlfriend. Also, the "Aspen" hotel is really The Stanley Hotel in Estes Park, Colorado. The Stanley is the hotel Stephen King based The Shining on.
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At the ball Helen and Harry are talking and in the background you can see Lloyd and his hat is on the bar. A second later he shows off his butt and he is holding his hat.
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Speaking of the airbag mistake, how about the fact that the hub of the steering wheel in the Cadillac Limo was small, and could no way have an air bag behind it?
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Early in the movie when Lloyd gets his wallet trapped in the newspaper machine, it shows his wallet, however in the very next shot his wallet is not there.
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When Mary's family is shown in their home in Aspen. Mary is sitting on the couch with hot chocolate in hand, and is shown with her right leg crossed over her left. However, when Nicholas walks in, magically Mary's left leg is crossed over her right.
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Before Harry and Lloyd begin their conversation about gambling, they seem to be driving by a lake; but from the inside, they're driving by a town.
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When Lloyd is trying on tuxedos, the shot from the back of Harry's head you see a short cigar in his mouth. In the next shot from behind (when he stands up), the cigar gets bigger.
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During the snow owl benefit, Mr. Swanson (Mary's dad) is introduced. The next shot is from behind the stage facing out to the crowd and you see Mary's stepmom (Teri Garr) raise her arm in the air as if to "present" Mr. Swanson. The very next shot is from the audience perspective facing the stage, and Teri's arm is at her side, and she raises it up again to present him.
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When Harry is speaking to the girl at the gas station, he tells her he's going to Aspen and she takes the cigarette she is smoking out of her mouth. When the camera pans to a front view of her jeep in the next shot, the cigarette is back in her mouth and she takes it out again.
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When Harry and Lloyd first arrive at the truck stop, you can see a man with a white hat leaving the diner after the 18-wheeler passes by. Later on in the scene, the same man is about to exit again.
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In the Unrated Version DVD, in the van sequence after Lloyd's second encounter with Seabass in the restroom, Harry says that he will stop talking about Lloyd's encounter with Seabass. Lloyd turns his head and looks over at Harry. Then it switches to a close-up on Lloyd from the other side, and we see him repeat the same action of turning his head and looking at Harry, this time more sharply.
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When Harry sits down on the toilet and lifts up his legs, his eyes are closed, and they remain closed until the very end of that particular shot. Then, when it switches to the front shot of Harry a few second later, his eyes are open, right from the very beginning of that shot. And if you look closely at that shot change, you don't see Harry do the action of opening his eyes - they just change instantly between the shots.
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Right before the officer on the bike calls Lloyd a "pumpkin-pie-haircut freak", Lloyd is sitting back, straight faced, then after the officer says it Lloyd is leaning forward smiling.
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When Lloyd asks if the bartender knows Mary, he originally grabs the bartender with the left hand. But in the next shot he lets go of him with his right hand.
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At the truck stop, in the side shot in which Lloyd tells Harry to toss some salt over his right shoulder, Harry is holding his straws at an angle off the table. Then it switches to a front shot of Harry, and he is now holding his straws vertically on the table.
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When Jim Carrey and Jeff Daniels are in the restaurant, just before they encounter Seabass and right after they call the waitress "Flo", Jeff's coke glass is on his right side. The next shot shows it on his left, then his right, then his left again, without him touching it.
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The position of Harry's glass of cola when laughing at the diner.
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The bathroom window in Harry's toilet scene.
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At the ball, when Helen and Harry are talking and in the background, you can see Lloyd's hat is on the bar. A second later when he shows off his butt, he is holding his hat.
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In the opening sequence, the limo Lloyd is driving appears to be around 6 to 8 feet away from the girl on the sidewalk. When the camera angle changes and Lloyd talks to the girl, the limo appears to be only 2 feet away from the sidewalk.
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When Harry and Lloyd both get back from work and they are sitting down, a glass bottle is standing up inside the small end table between the couch and the chair. Later in the scene, the bottle is knocked over.
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When Harry and Mary are wrestling in the snow, Mary is starting to roll over from having her face mashed into the snow. In the next shot her face is firmly planted in the snow again.
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In the Colorado scenes, the snow coverage on the ground is constantly changing.
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In the bar, Lloyd has two bottles in front of him. The bartender hands him another beer, and there are still two bottles. Later there are four bottles.
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When Harry and Lloyd are traveling from Nebraska to Aspen on the moped there are small wheels on the back of the bike and they come and go from scene to scene.
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After the policeman orders Harry to stop his van his motorbike is beside the van but in the next shot his bike is behind the van.
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When Harry and Lloyd start singing "Mockingbird," we see a front shot of the "gas man" getting annoyed and gritting his teeth. Then it switches to a side shot, and his annoyed expression is now different, instantly.
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Harry is wearing the bullet proof vest and gets shot. Yet there's no damage to it when he opens his shirt.
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When Joe Mentalino eats the rat poison pills in the cafe, he dies and the character collapses on the ground with his head facing the left. But when the body is placed on the trolly a few shots later, the "dead" Mentalino has somehow managed to move his head to the right.
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When Lloyd drops Mary off at the airport, the interior of the car is different once Lloyd gets back in.
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Lloyd reads the article about Mary and can't even pronounce the word "the", yet when Harry says look on the briefcase for her name, he says "Samsonite" with no problems, and Lloyd can easily read the "Man Walks On The Moon" newspaper headline in the hotel bar.
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When Mary and Harry are talking about the "Bull-Shit" there is a shot of Mary close up where she is laughing and smiling. Look behind her and you will see a woman in a black and gold glittery dress walk past. Then when the shot changes to both Mary and Harry together the woman is instantly 3 or 4 feet in front of where she was and seems to be engaged in a conversation with someone else already - instantly.
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In the scene at Harry and Lloyd's apartment, one of them opens a beer and throws the cap on the floor. In different shots the beer cap moves from place to place on the floor.
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There is a scene just after Lloyd meets Beth in the bar when Mary is skiing along and looks around for Harry who is still stuck on the ski lift. The shot is comprised of a long shot of her skiing to a grey marker and then a close up of her stopping and looking around. It is obvious in the shot when she comes up to the marker that the woman on the skis has much darker hair than Mary and is her "ski double".
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When Harry and Mary go out on the date to the ski resort, they get into a snowball fight. When Harry is shoving her face in the snow, the first time it shows Mary she is facing one way, but when they show her again she is facing a different way.
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Towards the beginning of the movie at Lloyd and Harry's apartment during the scene when Harry is behind the couch yelling at Lloyd about going to Aspen you can see an empty beer bottle, when Harry walks around the Couch again the beer bottle has moved.
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At the beginning of the movie, Harry's van has bucket seats, yet later on when the "gas-man" rides along, he is sitting on a bench seat in-between Harry and Lloyd.
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When Lloyd tackles Mary on the hotel stairs, she is wearing black pantyhose. By the time they get to the hotel room, she has miraculously changed into grey tights.
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When Lloyd drops Mary off at the airport and hugs her goodbye, in the background there are two men walking towards them. The camera changes to the angle behind Mary then behind Lloyd and then back to the side. When it returns to the side view the two men are farther away but still walking toward them.
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When Harry and Mary go out on the date to the ski resort, when they get into a snowball fight, the camera shows Harry, and it's snowing, but when they show Mary (who is supposed to be right beside him) it is not snowing. It keeps doing that, when it shows Harry it's snowing, and Mary it is not (or vice versa).
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After leaving the diner, Lloyd & Harry are pulled over by a motorcyle cop (Harland Williams). As the cop notices the beer bottles on the floor of the van, you'll notice his hair has a curl hanging over his forehead. Right before he takes a drink of one of the bottles, the curl is gone. It cuts to Lloyd & Harry trying for a brief second , and when it cuts back to the cop saying "You'd shut your mouth if you knew what was good for ya," the curl is back.
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When the "gas man" falls to the floor due to the atomic peppers that Harry and Lloyd sneaked into his burger, Harry and Lloyd laugh at him, and Lloyd even points at him. Then he stops pointing at him and looks at Harry. But only a moment later, in the very beginning of the next shot (a close-up of Harry and Lloyd), Lloyd is instantly pointing again.
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When Lloyd states that the map says they've only driven a quarter of an inch, you will see a creek with a unusual tree growing around it. You see the same creek and tree when Harry and Lloyd pick up the "gas man".
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Crew or equipment visible 

When Harry is on the toilet at Mary's, the dolly track is visible on the floor.
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When Harry and Lloyd are leaving Rhode Island in the van, a hand can be seen moving the curtain behind Harry's head.
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When the doves appear in Lloyd's dream sequence, we see crewmembers releasing doves while lying on the floor behind two pairs of their own white sneakers.
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When Lloyd asks Mary what are his chances of him and her being together, the camera crew is is reflected in the mirror in the background.
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When Lloyd slides along the airport floor to pick up the briefcase, he stops at a strip of yellow tape which marks the place where he should stand up.
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Errors in geography 

The time of Harry and Lloyd's trip takes place in late March, yet as they pass through Pennsylvania many of the deciduous trees have green leaves. At that latitude trees actually don't start sprouting leaves until late April.
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When first driving out of Rhode Island, they are heading north on Route 146, because you can see the Union Paper building in the shot. In the next shot showing the highway as they are driving, they are on 95 South, passing the "Big Blue Bug", a local pest control company building. There is no way they can be driving on both of these highways at the same time, they head in opposite directions.
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The lift operators at Aspen are wearing Copper Mountain uniforms. Copper Mountain is in a different part of Colorado, over two hours from Aspen.
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In the scene where Harry and Lloyd are on the bed in the presidential suite, crying and blowing their noses with money, they are watching a commercial for Pacific Bell. If they are in a hotel in Aspen, CO there is no way they would have seen that commercial on a hotel TV when the ad is clearly for a company that serves the west coast.
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In the second part of the movie Harry and Lloyd are supposed to be in Aspen. However, that part of the movie was filmed in Breckenridge. The town of Breckenridge has one main street where shops and restaurants are located with streets descending hills feeding into the main drag. Aspen is a town spread out across many blocks with rather busy traffic. This information was confirmed by the public relations director for the Breckenridge ski area.
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After Harry and Lloyd flee Dante's Inferno, an FBI agent states that "they were seen heading west on I-80." The next road you see them on is a rural two lane highway. Not a big four lane interstate like I-80.
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Just near the end of the film Lloyd and Harry are seen in a desert presumably the Phoenix Desert just days after Mary reunites with her husband. Given that the Phoenix Desert is many miles from Colorado it would take weeks for the duo to get there on foot.
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When Harry, Lloyd and Mentalino stop to eat, the sign identifies the stop as the "hottest meals east of the Mississipi." After Harry and Lloyd leave, it is established they are in Iowa, which is west of the Mississipi.
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Factual errors 

When Mary's husband Bobby is getting out of the police car at the end of the movie he opens the door from the inside himself instead of having to be let out.
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Airbags immediately deflate after deployment and do not stay inflated for more than 0.3 seconds as indicated.
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The sign the airport employee removes says Aspen but the airport in Aspen is actually called Aspen-Pitkin County airport.
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Incorrectly regarded as goofs 

On the note left for the "gas man" they misspell Aspen as "Aspin". This was most likely intentional since their lack of intelligence is a major part of the movie.
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Plot holes 

After the FBI rescue Lloyd, Harry and Mary from Nicholas Andre, Beth tells Lloyd and Harry they have been following them from Providence. However Beth and her colleagues were not seen in the film until after Joe was killed and didn't hear of Lloyd and Harry until they escaped.
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When Harry and Lloyd stop to pick up Mental at the side of the road, he claims that he's late for a luncheon. However, he then proceeds to stop for lunch with Harry and Lloyd (although it's possible that he assumed by their behavior that they were too stupid to realize this).
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Somehow the charges against Lloyd and Harry for Joe Mentaliono's death are dropped despite the fact the police including presumably Beth had a warrant for their arrest.
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Apparently Harry and Lloyd are stranded in Nebraska after their van runs out of gas. Lloyd though somehow is able to drive the van to the nearest town and sell the van.
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Mental ends up with Harry and Lloyd by acting stranded. He seemed very confident that they would stop. He also has the hood up in the car and tells his partner to lie in the don't seat. Not only would she not see them leave, but she would have also had to put the hood down to follow him. There is also the question of where she was when Mental dies in the restaurant.
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At the airport, how were Mary, and then Lloyd, able to go to the airport terminal where Mary's plane was without ever going through airport security?
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Revealing mistakes 

When Harry and Lloyd are reading the newspaper about the International Preservation Society, the exact same paragraphs are repeated many times throughout the paper.
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During the tongue scene, when Mary is pulling Harry's tongue off the ski lift, you can see Harry's real tongue right under the fake stretchy one.
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When Harry and Mary are making the snowman, there are three pre-formed holes where Mary puts the charcoal and carrot.
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The snow in the camp fire scene is obviously fake (fabric and/or plastic).
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Mary's skiing stunt-double, seen coming to a stop before the snowball fight, clearly has long black hair.
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After dropping Mary off at the airport, Lloyd puts the limousine in gear, but instead of putting the car in drive, he puts it in reverse, and then begins rolling forward.
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When Lloyd frantically checks the departure boards there is no sign of the airport in Aspen on the departure boards.
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When Harry and Mary are making a snowman, there is pair of skis stuck in the snow with the top hat hanging on them. But they have both changed out of their ski clothes, neither of them are wearing ski boots, and there is no other ski equipment there.
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When Lloyd and Mary are going to the airport, you can see a white van out the rear window. The driver is turning the steering wheel, but he keeps going straight.
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When Harry and Lloyd are at the restaurant with the kidnapper they give him the hot peppers. Then he falls to the floor and Lloyd is trying to give him C.P.R. If you look in the background you can see the waitress laughing in the first few shots.
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The Aspen lift operators are wearing Copper Mountain uniforms. Copper Mountain is in Colorado, but it is over two hours away from Aspen.
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When the air bag inflates at the airport and Lloyd is wrestling with it for a split second he pulls it back and you can see it is not attached to the steering wheel.
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When Harry throws the saltshaker, you can see it almost hit Seabass in the window's reflection, but it doesn't actually touch him, despite the sound effect.
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When Harry is lying on the bed at the end - you can see he's not wearing a bullet proof vest as the extra bulk they cause is not visible on his torso. However once he's shot, the bulk is visible under his shirt for the remainder of the scene.
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In the beginning of the film, Harry reaches for his radio after getting a call. The radio is not powered. You can see the display doesn't light up.
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When Lloyd comes back for Harry on the scooter, it has two small training wheels on the back. They disappear in the montage of the ride to Aspen and reappear when they pull into town.
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When Harry is talking to the lady in the gas station, and his legs catch fire, you can see the burn gel on his pants.
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Prior to the animal show, just before Harry feeds the second dog, you can see someone in the back throw a treat through the curtains to get the dog to go up front.
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At the Swanson's ski-lodge, there is snow on the rail of the balcony, but the mountains in the background are completely snowless.
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When Jim Carrey and Jeff Daniels are fighting at the park over the briefcase, the snow is obviously foam or some other material. The same thing also happens right when they get to Aspen and walking from the street on to the curb, the snow moves.
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In the scooter scene where Harry and Lloyd get overtaken by a truck, and making the truck driver honk his horn, Lloyd's middle finger lands extracted on the break handle thus showing f you sign.
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When Harry's legs catch fire, you can see the burn gel on his pants.
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When the champagne cork is flying towards the owls, the stick turning the cork is clearly visible (DVD Version Only).
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Outside the airport, after bumping his limo with another car, the airbag inflating towards Lloyd's face correctly originates from the center of the steering wheel. In next scene, while he is fighting with it in order to gain access to the airport, it has been replaced by another kind of a balloon, clearly not coming out from the steering wheel.
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When Harry and Lloyd are reading the newspaper about the International Preservation Society, the exact same paragraphs are repeated many times throughout the paper.
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When Lloyd and Mary are going to the airport, you can see a white van out the rear window. The driver is turning the steering wheel, but he keeps going straight.
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During the tongue scene, when Mary is pulling Harry's tongue off the ski lift, you can see Harry's real tongue right under the fake stretchy one.
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When Lloyd drives into the back of a car at the airport his air bag inflates and it looks it is made out of thin rubber translucent material. That is not what real air bags are made of.
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Spoilers

The goof items below may give away important plot points.

Character error 

Harry and Mary spend the early part of the day together and make plans to meet the evening of the same day at 7:45 pm. Later on that night (same day) as the three (Harry, Lloyd and Mary) are being held at gunpoint, Harry says, "Yesterday was the best day of my life. Mary and I went skiing....etc". But it wasn't 'yesterday', it was earlier the same day that Harry and Mary went skiing.
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After the FBI charges into the hotel room, Beth identifies herself as Special Officer Beth Jordan. FBI agents are actually known as Special Agents.
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Continuity 

After Harry is shot near the end of the movie, he reveals that he is wearing a bulletproof vest. The bulletproof vest, however, shows no damage from the gunshots to the chest.
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After Nicholas shoots Harry and is about to shoot Lloyd, his gun is obviously out of bullets as the slide part of the gun is cocked back and the barrel is exposed. Then in the very next shot, the gun is loaded again.
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Incorrectly regarded as goofs 

Harry throws the salt at Seabass in a Pennsylvania diner. Later the same man attacks Lloyd in a Nebraska bathroom. It's possible that Seabass is a trucker and happens to be in different parts of the country at different times through traveling (the diner and gas station bathroom would not be unfamiliar places for truckers).
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See also

Trivia | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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