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While filming Um Corpo que Cai (1958), Sir Alfred Hitchcock described some of the plot of this project to frequent Hitchcock leading man and "Vertigo" star James Stewart, who naturally assumed that Hitchcock meant to cast him in the Roger Thornhill role, and was eager to play it. Actually, Hitchcock wanted Cary Grant to play the role. By the time Hitchcock realized the misunderstanding, Stewart was so anxious to play Thornhill that rejecting him would have caused a great deal of disappointment. So Hitchcock delayed production on this movie until Stewart was already safely committed to filming Otto Preminger's "Anatomia de um Crime (1959)" before "officially" offering him the role in this movie. Stewart had no choice but to turn down the offer, allowing Hitchcock to cast Grant, the actor he had wanted all along.

During the scene in the diner at Mount Rushmore, a young extra boy in the background anticipates the surprise gun shot, fired by Eve. The diners are supposed to be unaware this is going to happen but the young extra boy covers his ears way before she draws the gun. The young extra boy must have known there would be a loud bang from the blank-filled pistol from previous takes and therefore covered his ears on the "printed" take.

Right after his credit as director during the opening credits, Alfred Hitchcock is running toward the door of the city bus just as it slams shut on him!

The print originally had an acknowledgement for the cooperation of the Department of the Interior and the National Park Service. But they requested it be removed after MGM violated the agreement that no violence would take place near the Mt. Rushmore monument. Some prints, however, were released with the acknowledgement still in.

Edited into Histoire(s) du cinéma: Le contrôle de l'univers (1999)