Trivia: If you look closely, there are many "Mickeys" in the scenery. For example, look in the bushes in various scenes and you will see three circles that form Mickey's head.
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: The dimitrodon, the dinosaur in the middle of the movie, is actually a real lizard (a basilisk, in fact) with a sail glued onto its back.
Trivia: Doris Day received her only Oscar nomination for her role as Jan Morrow in this film.
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.