Dial M for Murder

Halliday, Margot & Chief Insp. Hubbard all discover that it was Tony who set up Margot's attempted murder. They find out because Tony grabbed Swann's key and put that key in his wife's purse and the other key (his wife's key) was put back under the staircase cover right after Swann opened the door with it (Tony assumed that he was getting his wife's key from Swann's pocket, because Swann was supposed to put the key back under the staircase cover after he killed Margot, but he got Swann's own key instead). When Tony opens the door with the key that Swann put back under the staircase cover, he sees Halliday, Margot, Insp. Hubbard & Det. Williams and he knows that he has been caught.

Big Evil

Revealing mistake: Just before Anthony Dawson is going to be stabbed to death by Grace Kelly with a pair of scissors, you can see for a very short moment that the scissors are already attached to his back.

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Mark Halliday: What is all this?
Chief Insp. Hubbard: They talk about flat-footed policemen. May the saints protect us from the gifted amateur.

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Trivia: This was filmed in 3-D, but was not originally released in 3-D. It wasn't until after Hitchcock died that it was released in its original 3-D form.

Jack's Revenge

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Question: Who is in the photograph on the liquor table in the beginning?

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