Revealing mistake: The serial number of the autogyro has been reversed, showing that the stock shot has been reversed for effect.
The 39 Steps (1935)
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Directed by: Alfred Hitchcock
Starring: Robert Donat, Lucie Mannheim, Godfrey Tearle, Madeleine Carroll
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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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