- about 30 minutes in at the airport getting out of a wheelchair.
- Leon Uris wrote the first draft of the screenplay, but Hitchcock declared it unshootable at the last minute and called in Samuel A. Taylor (writer of Vertigo (1958)) to rewrite it from scratch. Some scenes were written just hours before they were shot.
- Hitchcock shot two versions with completely different endings. Both of them are included in the Laserdisc reissue.
- According to Hitchcock, this was another of his experimental movies. In addition to the dialogue, the plot is revealed through the use of colors, predominantly red, yellow and white. He admits that this did not work out.
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