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.
Dial M for Murder (1954)
Ending / spoiler
Directed by: Alfred Hitchcock
Starring: Ray Milland, Grace Kelly, Robert Cummings, John Williams
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
More mistakes in Dial M for Murder
Margot Mary Wendice: Oh, there you are. We thought you were never coming. What have you been up to?
Tony Wendice: I'm sorry darling, but the boss came in just as I was leaving.
Margot Mary Wendice: Tony, this is Mark Halliday.
Tony Wendice: Hello Mark.
Mark Halliday: Hello.
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.
More questions & answers from Dial M for Murder
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Chosen answer: It's mostly so the audience can see more of Tony's underlying character. This is Margo's bed, and Tony wanted it separate from the bedroom that they shared as husband and wife. Tony is "emotionally divorcing" himself from Margo as he is about to start a new life as a single man. Leaving the bed in the bedroom would serve as a reminder of his guilt in framing his innocent wife for a murder she did not commit. The bed is likely parked there until he can get rid of it.
raywest ★