- Actor Allusion: Takeshi Hongo as a Dogged Nice Guy only makes sense if you know that Masaya Kikawada was also one in Pretty Guardian Sailor Moon.
- Keep Circulating the Tapes: Licensed by Media Blasters, but the DVD is now out of print.
- Looping Lines: Eiji Maruyama looped Hideyo Amamoto's lines as Dr. Shinigami.
- Science Marches On: The film makes repeated references to a famous experiment involving ice crystals that has since been discredited (and most serious scientists thought was a bunch of New Age-y hippy crap from the get-go, anyway). In their defence, the film is just being poetic about it.
Trivia / Kamen Rider: The First