* ActorAllusion: Akihiko Hirata played another eyepatch-wearing character in [[Film/{{Gojira}} 1954]], but is a tragic hero in that film. Here, he's a villain.
* KeepCirculatingTheTapes: For a while, the only DVD release for this movie from Sony Entertainment was out of print. Fortunately, to coincide with the release of [[Film/{{Godzilla2014}} the 2014 remake of the original]] ''[[Film/{{Godzilla2014}} Gojira]]'', Kraken Releasing have re-released ''Ebirah'' and [[Film/GodzillaVsHedorah two]] [[Film/GodzillaVsGigan other]] Showa Godzilla movies on Blu-Ray and DVD.
** The now "rejected" Titan dub is only available on VHS releases.
* TheOtherDarrin: Mothra's fairies, originally played by the Peanuts, have been replaced by the Pair Bambi.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.