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Trivia: At one point they show a movie marquee that says "Dementia 13", which was Francis Ford Coppola's, American Graffiti's producer, first movie.

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Continuity mistake: When John is driving in his Ford and talking to the girl in the Studebaker, he drives past the same store "Marin Cameras" twice.

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Trivia: Harrison Ford wears a white cowboy hat in the film, because George Lucas wanted him to get his hair cut in the 1950's "crewcut" fashion. Ford didn't want to because it was in style to have longer hair at the time and he was afraid it would affect future acting jobs if he cut it. He convinced Lucas to just let him wear the hat to cover his hair.

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Revealing mistake: At one point John is complaining about the Beach Boys playing on his car radio, he reaches to the center console and motions turning the radio off. In a few other shots though, we see that the car appears to have no radio at all, the center console seems to have a large tachometer and speedometer there, but that's all.

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Trivia: Harrison Ford learned about the film and got the role through Fred Roos, who was the casting director of the film. At the time, Ford was working as Roos' personal carpenter.

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Trivia: Lucas actually had sort of an affinity for mistakes in this film. There were several instances where he would keep filming shot after shot until the actors would mess something up. Such as when when the guy leaves the liquor store and tosses the bottle to Terry, he stumbles and just about loses the bottle. Or when Terry goes back to the car, Debbie asks him "Did you get it? Did you get it?" but she noticeably flubs the lines up. Or even when the actor who plays Terry couldn't properly handle the motor scooter and has a small accident. These are instances where Lucas had many perfect takes of these scenes, but he kept the ones with mistakes in them to give the movie a more realistic feel.

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Trivia: When Terry is being introduced, he drives up on his scooter, and has quite a bit of trouble parking it. This is because Charles Martin Smith actually didn't know how to drive a stick shift. The small accident he has is real, you can see him crash, look up towards the camera (at Lucas), and continue the scene. Lucas motioned for him to continue, because the crash looked so interesting.

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Factual error: The Citroen 2CV that Kurt drives is a 1972 model. ten years after the film takes place.

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Continuity mistake: When Falfa's Chevy flips over, we can see that it has no fuel tank at all in it. However, in the next shot the car now has a visible fuel tank, and it explodes.

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Factual error: At the beginning of the movie, a red first generation Mustang coupe is parked across the street from Mel's drive-in. Mustangs didn't come out until 1964.

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Continuity mistake: Terry wears blue jeans throughout the whole film. Except when Debbie starts talking to him about how she likes tuck and roll interior, he gets out of his car and all of a sudden he's wearing khakis.

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Continuity mistake: After Falfa crashes his chevy, he walks away from the crash with his hat in his hand. In the next scene John is holding the hat and hands it back to him.

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Continuity mistake: Just as John was about to stop his car to let Carol in for the first time, he passed a dark color 4-door sedan parked at the curb. Then Carol runs around to get into John's car, the dark sedan disappeared and there is a blue 1955 Plymouth in its place.

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