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* 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 ''Hedorah'' and [[Film/EbirahHorrorOfTheDeep two]] [[Film/GodzillaVsGigan other]] Showa Godzilla movies on Blu-Ray and DVD.
* WhatCouldHaveBeen: A sequel to the film in which Godzilla would have fought a 2nd Hedorah that appears in Africa, inspired by one of Banno's favorite films, ''Film/AfricaAddio''. However, once [[WordOfGod Tomoyuki Tanaka (The producer of Godzilla)]] found out about the film, [[ExecutiveVeto He made a promise that Banno would NEVER direct another Godzilla film for the rest of his life]].
** This is sort of an urban legend that isn't true. Tanaka was disappointed with how "Godzilla vs. Hedorah" turned out, but he turned to Banno several times later (Banno was the first director Tanaka turned to to direct "Terror of Mechagodzilla"), but Banno's ideas were so far out again that Tanaka looked elsewhere.
** Additionally, a sequel idea before that was originally planned to have Godzilla battle against a Mutant Starfish.
** An IMAX 3D remake was in its planning stages around the time ''Film/GodzillaFinalWars'' was about to release in 2004. The project eventually morphed into ''Film/{{Godzilla 2014}}''.
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