* AssPull: The climax involving the volcano, [[spoiler:It comes out of nowhere and it's never actually specified how the Gargantuas were killed by it]]. Slightly justified since the film DID have [[WhatCouldHaveBeen a different ending]]...
* EvenBetterSequel: While ''Film/FrankensteinConquersTheWorld'' is considered quite a solid movie by many fans, ''Film/WarOfTheGargantuas'' is considered one of Toho's best and most underrated kaiju films.
* {{Narm}}: The American cut of the movie gave Gaira and Sanda the creative names of... Brown Gargantua and Green Gargantua.
* SequelDisplacement: While both films are fairly obscure outside of kaiju fandom, this one gets much more play on television than ''Frankenstein Conquers the World''. This can make the backstory about Frankenstein dying at the top of Mount Fuji somewhat confusing to first time viewers.
* UglyCute: Baby Sanda.
* SugarWiki/VisualEffectsOfAwesome: The miniature work in the movie ranks among some of Creator/EijiTsuburaya's best work as Sanda and Gaira's smaller sizes allowed for more detailed and realistic-looking sets while the monsters' humanoid appearances made them more expressive. The suits being less bulky than most kaiju also allowed for the stunt actors to be more energetic and agile than the genre typically allows.
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