Revealing mistake: The serial number of the autogyro has been reversed, showing that the stock shot has been reversed for effect.
Revealing mistake: During Mr Memory's act at the beginning of the film, a woman asks, "Who was the last British heavyweight champion of the world?". As she is saying this, you can see the man sitting next to her mouthing her exact words.
Revealing mistake: When the compere introduces Mr. Memory in the Music Hall at the start of the film, Robert Donat's stand-in is sitting in his place in the audience on at least two occasions.
Revealing mistake: During Mr Memory's performance at the end of the film, he stops speaking and flinches before the shot is fired.
