Factual error: The Inspector has no authority at all to release a convicted murderer about to be executed. Even if he could, the police presence would have been greater and Margot would have been in prison clothes or at least in restraints.
Dial M for Murder (1954)
1 factual error - chronological order
Directed by: Alfred Hitchcock
Starring: Ray Milland, Grace Kelly, Robert Cummings, John Williams
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.
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: Alfred Hitchcock wanted the film to look as natural as possible, with the camera at eye level with the actors. Since movie cameras were large (especially 3D cameras), Hitch had a small trench built into the soundstage floor, so that the camera lens was, roughly, at eye level.