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.
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: 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: In the montage of George Valentin writing checks, his address on the checks is 1110 Las Palmas Ave., Hollywood. However, in a long shot of the facade of his house, a curb marking very near the left edge of the frame reads "104."
Continuity mistake: When George Valentin wakes up at Peppy's house after the fire and discovers that she bought all of his things at the auction, the sheets he grabs that cover them keep switching hands.
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.
Continuity mistake: When Peppy Miller is stepping ahead in the casting scene, she puts down her things on the floor. In the next shot, when she starts dancing, her things disappear. After dancing, her stuff reappears on the floor, where she picks it up.