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.

  • Hey, It's That Guy!: Steve Carlson is played by Russell Johnson, The Professor from Gilligan's Island.
    • Coleman Francis (!) makes an uncredited cameo as a deliveryman.
    • One of the reporters talking to Cal is played by Olan Soule, better known as Ray Pinker of S.I.D., from the '60s episodes of Dragnet, or possibly as the voice of Batman in 1960s Filmation cartoons and the 1970s Super Friends.
  • Name's the Same: Don't confuse Exeter with the English city, or Brack with Brak.