Did You Know?

Cousin Eddie tells Clark that Daisy Mabel was born without a tongue. Soon after (towards the end of the scene), she can be seen sticking her tongue out.
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Clark's glasses after the accident, while sharing a beer with Rusty.
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As Russ goes to talk to his dad his hands are out of his jacket pockets. The next shot he has them in his pockets.
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Just after Clark nearly collides head on with the truck, a red truck can be seen following the Griswald's car. The red truck's distance behind the Griswald's car changes inconsistently between shots.
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When the kids discover Clark and Ellen under the blanket at the first motel, Clark emerges with a pair of beige panties. At the beginning of that scene when Ellen got into bed, they were patterned.
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As Clark and Ellen enter the office, Clark opens the door for Ellen using his right arm. As the view switches to an interior shot of them coming in, Clark is holding the door open with his left hand, with his left arm over Ellen's head.
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If the rides were running, then someone would be operating them, but the Griswalds and the guards were the only ones in the park.
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When Clark is getting undressed to swim with the "Ferrari Girl" he pulls his boxers off, yet when he jumps in and is swimming you can clearly see he's wearing flesh-colored briefs.
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Throughout the course of the film, the condition of the Family Truckster changes. Damage to the car will often disappear at one point but reappear in subsequent scenes.
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When Clark pulls up the trip route on the TV screen, the line representing their route is shown on the full US map traveling through the state of Oklahoma, but when Clark zooms in to show Day 1, the route line is shown going through Kansas, which would make more sense, since the Griswolds would be stopping to visit Cousin Eddie and his family in Kansas on their way to Walley World.
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Beverly D'Angelo's hairstyle changes quite dramatically towards the end of the film (at around the time that Aunt Edna is dropped off at Flagstaff), from wavy to a poodle perm.
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When Clark and Ellen get off the vibrating bed, Ellen was previously seen wearing only a blouse after she got out of the shower, but when the kids come in the room and Clark tells them to go away, he is pointing with a bra on his finger, one that Ellen was not wearing.
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When the family first gets to Walley World and find out its closed, Ellen's belt is above the loop. After they leave and return, her belt is through the loop.
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While the family is driving in the country, Ellen tells Clark to Slow Down! because they are doing "eighty miles per hour!", when in fact the road passing by clearly indicates they are not doing more than forty.
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Clark and the Motorcycle Cop are talking in close-up at the rear of the vehicle. A movie light is clearly visible reflecting off the cop's helmet as the sun is shining in a different place on the helmet.
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Mountains and palm trees near Chicago, in the opening scene when they are pulling into the car lot.
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When they stop for lunch, the rest area is just east of South Fork, CO. They leave and drive west over Wolf Creek Pass then down towards Pagosa Springs. You can see The Inn at the Pass at the bottom. But they spend the night in tents in South Fork. Did they get turned around at the pass?
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Tall mountains can be barely seen in the distance when the Griswalds arrive at and drive away from Cousin Eddie and Catherine's house & farm. There are no tall mountains in Kansas (the highest elevation is only over 4,000 feet above sea level in Wallace County, two counties to the North of Hamilton County, where the town of Coolidge is). The mountains visible in the background are in fact the Wet Mountains near Pueblo, Colorado, where the farm used to film Eddie's house was located.
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As the Griswolds are driving through Chicago, operating oil derricks can be seen in the background outside the vehicle's passenger windows.
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When purchasing a car in Illinois, either your license plates are transferred from your old car, or you are issued a License Applied For sticker to be posted in the window of your car (at that time). The Griswold's old car is driven off and crushed without removing the plates, and there is no sticker on the new car. They would be stopped and ticketed by the first cop that spotted them.
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In the scene in Kansas when Rusty is asking his cousin Dale whether he had "Pac Man", Dale says "no", but in the very next scene in Dale's room, a portable Pac Man game can be clearly seen on the bed behind Rusty. However, this is Rusty'S Pac Man game. He brought it along on the trip and it can be seen in the Truckster many times throughout the film. So Dale saying he does not have a Pac Man game is correct.
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During the opening credits postcard montage, one of the cards shows a billboard advertising "Gatorland Zoo, 6 miles away", and the post card heading mentions the billboard was photographed at St. Augustine, Florida. Gatorland Zoo is located in Kissimmee, Florida, which is over 120 miles away from St. Augustine. A few postcards later, another card appears from Gatorland Zoo, depicting the "alligator mouth" entrance, and that card is correctly headlined as Kissimmee, Florida. There are multiple Gatorland Zoos in Florida, one of which is indeed located 6 miles from St. Augustine. The second postcard references the Gatorland in Kissimee.
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When Clark falls onto the skeleton when wandering in the desert, a jaw spring can be seen in the back of the skull. This is used in the lab to keep the jaw shut, but obviously wouldn't be on a skull in the middle of nowhere.
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In the open matte version of the film, in the scene in which Ellen is in the shower, she can be seen wearing slightly pulled down underwear or possibly bikini bottoms.
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When the Griswolds fall asleep in the car, Clark awakes to see the predicament they're in. When his car is apparently in DRIVE, the car goes in REVERSE without stopping and/or changing gears.
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When the Griswolds are leaving Cousin Norm's house, you can see the breathing movements of whoever is under the blanket posing as the dead Aunt Edna in the patio chair.
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Obvious stunt driver for Clark 'asleep' at the wheel before they arrive at the first motel.
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