- about an hour into the movie walking past the house where the murder was committed.
- A German version called "Mary" was filmed at the same time using German actors, but the same sets.
- The scene where Sir John thinks out loud in front of a mirror had to be filmed with a recording of the lines and an orchestra hidden behind the set as it was not possible to dub the soundtrack later.
- This is the first movie where a person's thoughts are presented on the soundtrack of the film.
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