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Continuity: Peppy Miller is speaking with George Valentin on a stairwell as other people are walking up and down the stairs. At one point, a long shot shows a man in a black suit going up the stairs and passing George. In the following close-up of Peppy, the man has disappeared. Instead, two other men in light-colored suits are going up the stairs.
Factual error: When George is backstage and behind the screen, watching the movie premiere, the image in front of him is of a left hand drive car. Since the scene supposedly takes place in the country of Georgia, where left hand drive was the standard, the image as viewed from behind the screen should be reversed and so make the car appear to be a right hand drive.