The 39 Steps

Character mistake: The Professor refers to his pistol as a "revolver" but it is a semi-auto.

Character mistake: During Mr Memory's act at the beginning of the film, he gives the answer regarding the last British heavyweight boxing champion and then says, "Am I right, sir?", but the question was asked by a woman.

Revealing mistake: The serial number of the autogyro has been reversed, showing that the stock shot has been reversed for effect.

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Heckler in Audience: How old is Mae West? How old is Mae West?

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Trivia: Director Alfred Hitchcock has a cameo role in this film - he is seen tossing some litter as Richard and Annabella run from the music hall.

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