Dial M for Murder

Plot hole: The ending relies on Tony knowing where the key is on the stairs and Margot not knowing. Unfortunately there are any number of reasons for him knowing about a backup key that do not mean he is a murderer, and she could be smart enough to know she is certainly under police surveillance (and custody) and not touch the key on the stairs. Tony could easily make the argument that he had one made as a backup and put it there. Swann could have followed him one day and saw it and used it. His knowing the location of the key certainly does not necessarily mean he hired a hitman.

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Suggested correction: Under specific questioning both the Wendaces were clear to the Inspector that there are only two keys to the flat, hers and his, and no maid etc has a key. So, if later he then tells the police that he had made a duplicate which Swann had seen him use, he would be accused of lying to the police - and they would be very suspicious as to why would he lie about it: if he had told the truth at the start that there was a third key that would have shown how Swann got in, and got his wife Margot off the hook for letting him in. And anyway, for that to work, that would mean there should be 3 keys that fit the lock but the are only two; if the one the stairs is a duplicate 3rd, and the Inspector has Wendace's, then where is Margo's key? The key in her bag is actually Swann's key.

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.

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.

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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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