Revealing mistake: During the interrogation after the Albert Hall assassination attempt, the telephone used is an obvious Western Electric American-made phone instead of a British-manufactured telephone, betraying the fact that the interiors for the movie were shot in Hollywood.
The Man Who Knew Too Much (1956)
1 revealing mistake - chronological order
Directed by: Alfred Hitchcock
Starring: James Stewart, Doris Day, Brenda de Banzie, Bernard Miles
Visible crew/equipment: When James Stewart tells Doris Day that he lied about the telephone call being from the hotel, Doris gets excited and James struggles with her on the bed. During that scene, you can see on the upper left corner a shadow of a microphone.
Jo McKenna: So, what do you do?
Louis Bernard: I buy and sell.
Jo McKenna: I see. And what do you buy and sell?
Louis Bernard: Whatever gives the most profit.
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