Movie fans and fans of a particular franchise love to dig out trivia behind the movies they love, and science fiction is full of it. When you go back to the pre-internet era, you are very likely to find lots of obscure information that even fans don't already know.
These sound like the product of a brainstorming session where the most obscure fact about movies everyone has seen were thrown out, possibly with a prize at stake. Check out all 15 trivial facts about science fiction movies. -via TVOM