- in the Moroccan marketplace watching the acrobats with his back to the camera just before the murder.
- Bernard Herrmann (the composer of the score) can be seen conducting the orchestra during the Albert Hall sequence.
- The plot calls for a man (Daniel Gelin in the role of Louis Bernard) to be discovered as "not Moroccan" because he was wearing black makeup. The makeup artists couldn't find a black substance that would come off easily, and so they painted the fingers of the other man (Jimmy Stewart) white, so that he would leave pale streaks on the other man's skin (according to Pat Hitchcock O'Connell, this idea was suggested by Daniel Gelin).
- The Albert Hall sequence lasts 12 minutes without a single word of dialogue and consists of 124 shots.
- The film was unavailable for decades because its rights (together with four other pictures of the same period) were bought back by Hitchcock and left as part of his legacy to his daughter. They've been known for long as the infamous "5 lost Hitchcocks" amongst film buffs, and were re-released in theatres around 1984 after a 30-year absence. The others are Rear Window (1954), Rope (1948), Trouble with Harry, The (1955), and Vertigo (1958)
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