Continuity mistake: Before Tony leaves he closes the drapes. He then says he won't go out and will stay home. She says to go out, and he agrees, so he goes to the drapes and closes them again.
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: How long have you known this?
Chief Insp. Hubbard: Did you suspect it yourself?
Margot Mary Wendice: No, never. And yet... What's the matter with me, Mark? I don't seem able to feel anything.
Trivia: Alfred Hitchcock's cameo in this film is one of the harder ones to spot: he appears in the photograph of Tony and Lesgate's Cambridge class reunion.
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 ★