Continuity mistake: 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: The airplane that is used in the film they are watching at the start is a Ryan ST. The Ryan ST had it's first flight in 1935.
Continuity mistake: When Peppy and George meet, Peppy drops her notebook on the floor as shown in a shot of the ground, but when it flips back to her upper body the notebook is still in her hand. When she bends down she then picks it up from the floor.
Factual error: Driveway cut outs with tapered edges were not extant during the time period of this film.
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.