Revealing mistake: Dave is racing with the Italians, and the Italian puts his pump in Dave's spokes. In the middle of the bike falling over, you see a horizontal beige object with duct tape on it for a couple of frames, where you should see Dave.
Breaking Away (1979)
1 revealing mistake - chronological order
Directed by: Peter Yates
Starring: Dennis Quaid, Daniel Stern, Jackie Earle Haley, Dennis Christopher
Continuity mistake: In the climactic race scene near the end, every time the camera cuts back to a long shot of the race, the lap number on the board goes up and down, rather than going up sequentially.
Dad: I dreamed all last night, that everyone I ever sold a car to came back for a refund. And there you were, handing out the checks! One for you, and one for you.