Trivia: The Mysterians
- Executive Meddling: Ishiro Honda originally wanted to make the film without a giant monster, but Tomoyuki Tanaka insisted that there be one. Thus, the Moguera was born. Not that this is a bad thing, mind you.
- Also the reason the RKO version was not present on the DVD. Toho hates this version for no reason, and the copyright should've reverted back to them in any case.
- Hey, It's That Voice!: Bret Morrison, who dubbed Kumayama in the English dub of Mothra vs. Godzilla, voices several characters in the original English release, possibly the Mysterian leader as well. Many other Titra/Titan actors are present, though their voices are harder to recognize because they were all younger and didn't put on the phony Japanese accents for the most part.
- Keep Circulating the Tapes: The only way to watch the original RKO/MGM U.S. version outside of actual film prints.