The opening scene show London's Ambassadors Theatre with a board advertising "5th year" of "The Mousetrap", the Agatha Christie play. It opened in 1952 and is still running [2020].
Agatha Christie's play The Mousetrap gets two namechecks in this film. First, at the beginning, there is a shot of the Ambassador Theatre where it was being performed. Much later, in Crawford's hotel, there is a small poster near the telephone in the bar advertising the play.
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