Trivia: Although Martha Scott plays Charlton Heston's mother in this film, she was only ten years his senior.
Trivia: Not a mistake, just a fact. According to I.A.L. Diamond,Tony Curtis' "Josephine" voice was dubbed by another actor, as Curtis couldn't speak high enough.
Trivia: Ava Gardner was not impressed with Melbourne which she regarded as a sleepy little backwater, but her supposed quote that it was "the perfect place to make a film about the end of the world." was a journalistic invention by a sub-editor on the Sydney Morning Herald.
Trivia: Robert Vaughn received his only Academy Award nomination for his role as Chester A. Gwynn in this movie.
Trivia: Hermione Baddeley's performance in this film is the shortest ever to be nominated for an Academy Award. She had only 2 minutes and 20 seconds of screen time.
Trivia: Anthony Quinn plays Craig Belden, the father of Rick (Earl Holliman). In real life, Quinn was only 13 years older than Holliman.