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.
The Man Who Knew Too Much (1956)
1 visible crew/equipment mistake - chronological order
Directed by: Alfred Hitchcock
Starring: James Stewart, Doris Day, Brenda de Banzie, Bernard Miles
Continuity mistake: Dr. McKenna is wearing a blue suit and hat during the bus ride in the beginning of the movie and then again as the family board the wagon and set out for their hotel. When the wagon arrives at their hotel and everyone gets out, McKenna's suit and hat have suddenly switched to light gray.
Edward Drayton: Remember, you will only have time for just one shot. If you need another, the risk is yours.
Rien: I don't take risks.
Trivia: Alfred Hitchcock makes his regular cameo watching a group of street entertainers.