Did You Know?

Biff's preferred porn is called "Oh La La" magazine, Marty pronounces the magazine as "Ooh La La," a common American mistake.
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When Strickland and Marty are talking to each other in the alternate 1985, there are cracks in the sills around the window and the front door. When the car full of armed "slackers" starts shooting at them, the cracks in the sills disappear.
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The cooling vents on the back of the DeLorean change between silver and black throughout the film. A clear example of this is the first landing scene of the DeLorean in the alley in 2015.
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When Marty is on the hoverboard nearing Biff on Biff's side of the car, one shot shows Marty very close to Biff, and in the next shot, he is at the back of the car.
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When Marty is sneaking into Strickland's office, the US and California flags are next to each other, away from the stack of books on the desk. In the next shot, when Marty reaches to move the US flag, the California flag has already been moved next to the books.
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Doc has a watch on both wrists. The one on his left hand alternates from dial-in to dial-out throughout the film. Most noticeable right at the beginning when they are arriving in 2015. It is inside his wrist as they arrive but outside when he get out of the Delorean.
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When Marty walks out of the alley (where the DeLorean first lands in 2015) we see a dark blue car with a white stripe taking off. In the next shot of the same runway, there's a light blue car taking off.
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Marty is able to cross the café instantly as the camera cuts (just before saying "I'll show you")
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As young Biff is chasing Marty through the tunnel after Marty gets the almanac back, Marty pushes off with his right foot with his left foot on the back of the board (riding goofy). Later, as an upper body shot of him is shown, Marty is facing the other direction, with his left foot on the front of the board (riding regular).
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When Marty is hanging onto the rope of the jeep while being chased by Biff's gang, he hits the windshield of the car and goes flying toward the lake and the rope completely disappears between shots.
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When Marty and Doc are getting ready to go back to 1955 to get the sports almanac, Doc makes a point of turning the time circuits on. However, they were already on, which is evidenced right before this when they are shown to be malfunctioning.
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The almanac is constantly folded up and put into the pockets of McFly and Biff; however many times the almanac is shown flat with no creases on it.
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In the ally way in 2015 when Marty is putting on the jacket Jeniffer's arm is laying on something blue. But when Doc Brown presses the size adjustment button on Marty's jacket, Jeniffer's arm is now resting on something beige.
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Just after the DeLorean lands in the alley, Doc opens the door and his robe/coat is already wet before he sticks his leg out.
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In the opening scene the background vehicles change in several ways. The VW Bus changes position and color first green then tan. It also goes from next door to two houses down. The Chevrolet Suburban across the street changes from the original mid '60's era to a early '70's model. Its position also changes slightly.
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Marty jumps into water after his hover board quits, but in the next scene he is walking up some stairs.
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When Marty jumps into the water and Griff and his gang fly into the courthouse, the crew (looks like a crane camera) is reflected in the door that Griff smashes through.
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When Marty and Doc talk about going back to 1955, whenever the camera is focused on Marty, you can see what looks like some sort of mechanical device or someone using the equipment outside of the window. This can be seen between 01:01:56 and 01:01:57 and also 01:02:03 and 01:02:06
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At the beginning of the film, as the Doc departs the McFly house with Marty and Jennifer, the camera is briefly reflected in the rear futuristic shiny license plate.
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When the DeLorean is following behind Biff's car and Marty is climbing along the side of the DeLorean towards Biff, a wheel used to roll the "hovering" DeLorean along the ground is visible underneath the front right tire.
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As the DeLorean is landing in the ally in 2015 - when the tires rotate down - you can see the mechanical arm lowering the vehicle.
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As Biff and the two ladies in the hot tub were watching A Fistful of Dollars, scenes are shown out of order.
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In the tunnel scene, as Biff is preparing to chase Marty, the car's front tag is dated 1951. California-registered cars had 1951-dated license plates in 1955; a small metal "55" tab was placed over the "51" stamped into the plate to keep the registration current.
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Marty's Japanese boss in 2015 is called "Fujitsu-san". Fujitsu is not a real Japanese last name, but the contraction of "Fuji Tsushinki" (Fuji Telecommunications), "Fuji" being likewise the union of the first syllables of "Furukawa" and "Siemens" ("Si" is pronounced "Ji" in Japanese"). It is very unlikely that a Japanese person bears that name, which is actually a trademark. The gag is that trademarks and commercialism have gotten out of hand in the "future."
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When Marty is watching his other self talking to his parents, Biff's shadow can be seen on the wall. He is waiting for his cue.
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As Griff's thugs are about to crash into the clock tower, you can clearly see the reflection of the huge wiring harness holding them up.
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When Mr. Strickland and Marty are talking on Strickland's front porch in the alternate 1985, Strickland can be seen mouthing several of Marty's lines.
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When Doc, Marty, and the unconscious Jennifer are landing the DeLorean in the alley in 2015, the wires suspending it from its corners are clearly visible.
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When Biff starts in on Marty with "You think that stupid disguise is gonna get past me?" he challenges Marty to a fight and Marty says, "No, Thanks," and turns to exit the shot. The edge of the window in the background is the split. When Marty turns, the brim of his hat just barely crosses the line, causing it to disappear for a few frames.
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When Marty confronts Biff about the Sports Almanac; Biff pulls a revolver and points it at Marty. There are no bullets in the gun; otherwise, the tips of the bullets would be visible in the cylinder. There are blanks in the gun which are shorter and not visible.
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When the DeLorean is landing in the alley in 2015 it is raining, but a camera angle shows the main street at the end of the alley and the cars going by are in the sunshine.
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The miniature Deloreans used in effects shots have no key locks on their doors, making it easy to determine whether a model or the actual vehicle is being used in a scene. This is especially true in shots where the car is touching down, and split screens are used to mask the transition from model to full-size vehicle.
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When Marty is being chased by 1955 Biff in the tunnel, in the wide-high shot, Marty is actually riding a skateboard, not the hoverboard.
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When, in 2015, Marty presses the drying mode on his jacket, the jacket tells him "your jacket is now dry" when it is clearly still wet. He's not wearing an actual dry jacket until the next scene when he goes to give the girl her hoverboard back.
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When Marty sees George deck Biff, we see the Marty from Back to the Future running out to the parking lot. When he glances at the photo and splits, the couple he runs in to are completely different to the actors in the first movie and they don't say anything to each other, whereas they should have been seen to say 'Who is that guy?' 'That's George McFly.' 'THAT'S George McFly?' as they did in the first movie before Marty bumps in to them. Furthermore, when Lorraine is picked up off the floor by George, we see his hair is shaved very close at the back and sides, but in the next shot the new actor playing George who leads Lorraine away doesn't have closely shaved hair.
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