Corrected entry: After the trial, Chief Inspector Hubbard visits Tony to execute a complicated ruse that he had prearranged with Sergeant O'Brian (at the station) and Detective Williams (stationed upstairs). The ruse relies on the inspector mentioning Margot's handbag and switching raincoats with Tony. The inspector would have left the apartment without doing either of those things had it not been for Mark being present and calling out to the inspector, but the inspector would not have expected Mark to be in the apartment.
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Correction: We do not know that the Inspector did not have some other plan to do these things, to come back some moments later for example. He could have just taken advantage of Mark's appearance.
There are an infinite number of things in any fictional movie that we do not know. It's possible to make up alternate facts to suit an alternative plot line - but that would be a different movie. My plot hole does not rely on an alternative that the inspector did not express.
jmat