- Unintentional Period Piece: The plates on which the Bronson bodies were discovered are being shipped to the United States. By flying boat. The film also features a mechanical computer.
- What Might Have Been: Cecil B. DeMille considered making an adaptation soon after the novel's publication in The '30s. In addition, Pal wanted to make a sequel based on After Worlds Collide.
Trivia / When Worlds Collide