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.
Visible crew/equipment: While Tony is blackmailing Charles Swann, describing the story in the newspapers regarding the "middle-aged woman found dead due to an overdose...", just as Tony takes a seat on the table we can see the moving shadow of the boom mic on the wall, over the picture. (00:25:10)Super Grover
C.A. Swan: Just a minute. I'm supposed to have come in through these windows. Suppose they'd been locked?
Tony Wendice: It wouldn't matter. You see, she often takes a walk around the garden before she goes to bed, and she usually forgets to lock up when she gets back. That's what I shall tell the police.
C.A. Swan: Yes, but she may say that.
Tony Wendice: But she isn't going to say anything, is she?
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