- 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.
- Or indeed Barack...
- Prop Recycling: The "picture of a burger" on Exeter's office wall was apparently a stock prop in Universal films. It made another appearance in The Leech Woman (mentioned on that film's Mystery Science Theater 3000 episode as an "original Ray Kroc".)
Trivia / This Island Earth