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The entire movie was filmed over a span of about 29 consecutive days, and George Lucas generally didn't allow scenes to be re-shot if they came out plausible. Thus, entire scenes in the movie have botched lines and ad-libbed parts, the best of which probably being Toad's boasting about Milner's racing ability after Falfa rolls his car: Charlie Martin Smith couldn't remember most of his lines when they shot this scene, and made almost all of them up on the spot. See more...
American Graffiti (1973) - 3 major mistakes
Directed by George Lucas, starring Charles Martin Smith, Harrison Ford, Richard Dreyfuss, Ron Howard (add more)