Revealing mistake: In the beginning, the harem teacher and his pupils read the story (which becomes the movie) from the book Arabian Nights. The huge book propped up in front of the old man, though, is only an empty cover with no pages at all.
Factual error: Orville says that he born on September 13, 1913, a Friday. That was actually a Saturday. (00:46:10)
Continuity mistake: The closeup of the Soda City calendar shows a much heavier coating of spider webs than the previous shot.
Factual error: When King Cutler shoots his brother near the end of the film, he uses a revolver, a weapon not produced until the next decade.
Revealing mistake: Inventor Dr.Tobel is shown with his bomb sight. Later in the film we see the same equipment, only this time it is Sherlock Holmes' ultraviolet light apparatus. (00:22:05 - 00:45:30)
Continuity mistake: Near the end, as a plane is getting ready to run down the airstrip, Bogie knocks the gunman out, then uses the gun to shoot the plane in its tracks. When the machine gun starts to fire, it has a long strip of bullets, then fewer, and so on.