Continuity mistake: In the scene In the McKittrick hotel, the manager tells Scotty Madeleine often stops by but hadn't been by today. Incredulous, he insists on seeing her room but finds that she has disappeared. One shot shows her door left open and another shows it closed.
Suggested correction: A couple things. Scotty tells the manager to go look in the room while he waits downstairs. She goes up, then calls down to him and asks if he wants to see the room. As they walk down the hall, the door to Madeleine's room is closed. The manager opens it, and she and Scotty go inside. The door was always closed until they went in. The lighting on the door in the first shot of it makes it appear much lighter in color, giving the impression that it was open and the interior is being seen, but it is closed.
Trivia: The McKittrick Hotel was a very real building in San Francisco. The indoor set was the same one used by Hitchcock two years later in the film "Psycho."
Suggested correction: The McKittrick Hotel lobby and staircase scenes were all shot on location in San Francisco in the Henry F. Fortmann mansion. Proof can be seen in a book about the house in photos taken before it was demolished by Sacred Heart Prep School. The Psycho mansion interiors were all shot on a Hollywood soundstage.
