- Hitchcock wanted an ambiguous ending to the film, but the studio wouldn't allow it to be implied that the lodger might actually be the murderer.
- The movie is based on the book of the same name. It was the first book to offer a solution to the Jack The Ripper killings. The book is supposedly based on an anecdote told to the painter Walter Sickert by the landlady when renting a room; she said that the previous tenant had been Jack the Ripper
- a desk in the newsroom early in the film. Some people claim he also appears later in the crowd lynch scene.
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