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
Continuity mistake: Although the assassin and the ambassador are seated in the same tier of boxes, the assassin's view of his target through the opera glasses is from below and not from across.
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.
More trivia for The Man Who Knew Too Much