Trivia / This Island Earth
- The Metalunian mutant's blood was not ordinary fake blood, but actual tomato ketchup, which started to go off under the hot studio lights.
- Name's the Same: Don't confuse Exeter with the English city, or Brack with Brak.
- Retroactive Recognition: It would be decades before Coleman Francis became a B-Movie personality. He appears briefly as a postman in the film.
- While a science fiction movie instead of horror, the Metaluna Mutant has been included in some sets of Universal Monsters merchandise.