Der Mann, der zuviel wußte

Throughout the filming, Doris Day became increasingly concerned that Sir Alfred Hitchcock paid more attention to camera set-ups, lighting, and technical matters than he did to her performance. Convinced that he was displeased with her work, she finally confronted him. His reply was, "My dear Miss Day, if you weren't giving me what I wanted, then I would have to direct you!"

When Hank is being taken by his kidnappers from the chapel to the embassy, the group gets in a left-hand drive large 1953 Humber Mark IV Super Snipe on a Hollywood sound stage. The pretend driver enters on the right, but the supposed front seat passenger can be seen releasing the handbrake, and holding the steering wheel. The car's exhaust sound also does not match the Humber. In the second scene later, the same car enters the embassy rear gate, also on a Hollywood sound stage, and the car can be seen as having red seats. In the next cut, the car pulls up at the rear of the embassy, and Hank and the kidnappers exit. The car has now become a smaller and earlier 1951 Humber Mark IV Hawk, with tan seats, filmed on location in London, although both cars show the same registration number.

Opening credits prologue: A single crash of Cymbals and how it rocked the lives of an American family.

The original film opened with the Paramount logo followed by their patented wide-screen process, Vista Vision. In the 1980s, Universal reissued the film with their logo, and dropped the reference to Vista Vision. The Blu-Ray edition retains the Paramount/Vista Vision logos at the start, but carries the '80s Universal logo at the end.

Edited into Geschichte(n) des Kinos: Le contrôle de l'univers (1999)