* TheOtherDarrin: Mothra's fairies, originally played by the Peanuts, have been replaced by the Pair Bambi.
* PlayingAgainstType: Akihiko Hirata as the evil Captain Ryuui
* WhatCouldHaveBeen: [[Film/KingKongVsGodzilla King Kong]] was originally going to be the star monster of the film and was going to be the one that fought Ebirah and Mothra. However, [[ExecutiveMeddling tension arose between Toho and Rankin-Bass over the direction of the film]] until Rankin-Bass finally quit the project, taking the rights to Kong with them. As a result, Godzilla was used instead. To add onto the Mythos, Nearly all of Kong's mannerisms and role was recycled into Godzilla in the film.