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Continuity mistake: After the bartender prepares the wake-up juice, the two men by the table behind, plus the smoke coming out of the ashtray, disappear. When Marty pours the liquid the men reappear. (01:19:43)

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Revealing mistake: When Marty pours the wake-up juice through the funnel into Doc's mouth, in the close-up the funnel is straight, but we can't see Doc. From a different angle where we do see the funnel stuck in his mouth, check the right side of the screen: The funnel is actually skewed (and seemingly it must have a tap) and the liquid is falling out in large amounts to prevent the actor from drinking it. (01:20:04)

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Continuity mistake: Just when Marty parks inside the cave to hide from the Native Americans, one wearing a war bonnet jumps over the mount. When the angle changes, the man is gone and has been replaced by two riders with no war bonnets.

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Revealing mistake: When Peyton's hands are about to be burnt, they are a replaced by a very obvious prop.

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Continuity mistake: The wet coffee circle stain on the paper is above the word 'date'. When the angle changes and the stain is dry, the circle has moved several centimeters below and is now surrounding the word 'date'.

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Deliberate mistake: When the movie begins, Durant's men are frisked by Eddie's, one of whom was tossing his nunchucku seconds before. Angle cuts to Durant's men's weapons falling on the floor, the nunchucku among them. This adds up for tension as to show how heavily armed and dangerous Durant is, but is absurd that Eddie's goon disposes of his own weapon in such a dangerous situation.

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Continuity mistake: Clara climbs down the cliff with Captain holding her hand. His position changes between shots: He is either leaning over the cliff, or resting aside.

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Continuity mistake: When Clara is locked in the tower she opens the egg and reveals a mirror. Her face is covered in thin strands of hair. She walks to the Captain and now her face is clear. Then a shot later a strand has fallen over her forehead.

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Continuity mistake: When Captain opens the bridge gate he puts his right hand to his chest. From the opposite shot it's down.

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Continuity mistake: After Doc meets Clara he and Marty watch a tombstone. Doc grabs the picture and says "my name has vanished!" The way he holds the picture differs between the first and second shot.

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Continuity mistake: When Buford duels Marty, the people behind him differ between shots. In the shot outside, there's a tall man with a blue shirt, a young guy and a man with a white shirt. From the angle shot inside the bar, the number of people behind the group has doubled, the man in white is gone and a woman has magically appeared standing next to the man with the blue shirt.

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Continuity mistake: When Doc passes out after drinking whiskey, he falls face down against a table and his back gets wet. When the angle changes it's dry and covered with glass.

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Continuity mistake: At the bar Doc says that in the future people run for fun. When the guys playing poker laugh at him, the bartender magically appears next to them between shots. (01:17:43)

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Continuity mistake: When Marty arrives at the bar the bartender lays both hands on the counter, the right one next to a bottle. When the angle changes, his right arm is up and the bottle is half a meter away. This changes back and forth depending on the angle.

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Continuity mistake: After visiting Seamus, Marty walks to the Hill Valley train station where a man is by the ticket window. In the next shot the man has disappeared. (00:26:35)

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Continuity mistake: When Marty holds the baby, the gown covers his legs. In the close-up the gown is up and the legs are bare. (00:26:03)

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Continuity mistake: Watch the guy at the back of Needles' car, the one holding a Pepsi can. The position of his right arm has no continuity in any shot.

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Continuity mistake: When Marty is about to race against Needles, he spins around and his truck goes in reverse. Jennifer ducks, but a shot later, from a different angle, she is sitting tall.

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Continuity mistake: When Brian tells Freddie about "We will rock you", they both clap. Right before Freddie asks "What's the lyrics?" he raises his hands to clap but from the opposite angle they are down and he isn't clapping any more.

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Continuity mistake: When Freddie lies in bed with Mary, she has her head on a sketchbook with the Queen logo drawn on it. The sketchbook keeps changing positions between shots.

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