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Continuity mistake: Before Marty kicks the speaker while playing Johnny B Goode, there is a case of Pepsi below it which disappears between shots.

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Continuity mistake: At the school when Marty is about to fight Biff, in the background there is food that changes position between shots.

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Continuity mistake: After Marty wakes up at his mother's place, she sits on the bed and leaves her coat that changes position between shots.

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Continuity mistake: After George knocks Biff behind Marty there is a couple running to George, but in the open view they disappear.

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Continuity mistake: When George is checking the time at the prom there is a girl in grey behind him that changes to one in pink. (01:18:56)

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Continuity mistake: After Marty gets to the square in 1955 his hair changes after he grabs the newspaper.

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Continuity mistake: While Marty is talking with Jennifer in the square he is holding a tape case in his left hand which disappears in the next shots.

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Continuity mistake: While Doc is explaining to Marty how the machine works, he has a device on his index finger on his right hand that moves in the next shots.

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