* SugarWiki/AwesomeMusic: While the music was indeed lifted from other sources, one cannot deny that the editors were very wise with the selections that they chose, since this would be the last film until Godzilla vs. Mechagodzilla II to feature Godzilla's theme as it was heard in Mothra vs. Godzilla. The music from Mitsubishi Pavilion is also very wonderful and when it's used during Anguirus's friendship moment. It strikes a chord. What's not recycled, is Kunio Miyauchi's catchy Godzilla March as sung by Susumi Ishikawa.
* BadassDecay: King Ghidorah is often seen as this. While he's undeniably threatening when paired with Gigan, they turn into mediocre fighters when the aliens lost control over them, shifting the victory in favor of Godzilla and Anguirus.
* BigLippedAlligatorMoment: There are scenes where Godzilla talks to Anguirus with comic-book style speech bubbles. The kaijus never talk again after this. The English dub takes this further by having Goji and Angy [[https://www.youtube.com/watch?v=ALeoiZrr5-Q speak outright, complete with voice actors!]]
* CommonKnowledge: It is often asserted that Gigan is the first monster to make Godzilla bleed, and while this would certainly seem to be the case given how much blood he makes Godzilla shed, that honour actually goes to Hedorah in ''Film/GodzillaVsHedorah'', as Godzilla begins bleeding from the top of his head after headbutting Hedorah away during their final battle.
* CompleteMonster: The titular cyborg monstrosity, [[{{Sadist}} Gigan]], was nearly as vicious as his compatriot Ghidorah, burning most of Tokyo to the ground, laughing all the while. What truly made Gigan stand out, however, was his sadistic love of hurting others. During his and Ghidorah's battle with Godzilla and Anguirus, Gigan repeatedly opted to go for torture rather than finishing an opponent off, dragging the other monsters in close and using his buzzsaw to carve pieces off of them, and showing a distinct preference for targeting those who could not fight back, attacking a severely wounded Godzilla while he lay bleeding on the ground, and later, in ''Film/GodzillaVsMegalon'', teaming with Megalon to deliver a NoHoldsBarredBeatdown to Jet Jaguar. Prone to [[DirtyCoward abandoning his allies]] as soon as the going gets tough, and hating a fair fight, Gigan was Toho's reigning king of KickThemWhileTheyAreDown.
* ContestedSequel: Not as divisive as other Showa Era films as it’s often agreed to be one of the lesser entries, but depending on the fan this film is either a bland espionage film with an overuse of StockFootage and really, ''really'' bad effects, or a good throwback to the 60’s Showa Godzilla films with a well rounded human cast and great monster fights and cinematography that’s not stock footage. This film is also seen as the point where the Showa era began to regain some steam, as its quality began gradually improving through the next few entries in the franchise. As discussed under EnsembleDarkhorse below, one thing everyone seems to agree on is that Gigan is a pretty awesome addition to the monster cast.
* EnsembleDarkhorse:
** If Anguirus wasn't this already, he certainly was after this film.
** Gigan's only other movie appearance in the Showa-Era would be the next film, ''Film/GodzillaVsMegalon'', which is just as [[SoBadItsGood bad]], but was so popular he came back as one of the major villains in ''Film/GodzillaFinalWars''. He also appeared in the ''Series/ZoneFighter'' TV series, where he went another round with Godzilla and was finally killed, and appears in just about every Godzilla video game.
** Amongst the human cast, Shosaku Takasugi ("Corn Guy") is fondly remembered as a likable and funny hippie who [[BewareTheSillyOnes kicks serious ass]] when times get tough.
* FanNickname: Fans have commonly named Shosaku Takasugi as "Corn Guy" after his introductory scene where he accidentally makes the main character faint, believing he assumed his corn was a gun.
* HilariousInHindsight: The [[https://wikizilla.org/w/images/1/14/Godzilla.jp_-_12_-_Godzilla_Tower.jpg Godzilla Tower bears a rather strong resemblance]] to [[Film/Godzilla2014 Godzilla's 2014 design]], with prominent eyebrows, stumpy legs and smaller, straighter back plates.
* MemeticMutation: Shosaku [[FanNickname "Corn Guy"]] Takasugi is popular amongst G-Fans [[https://cdn.discordapp.com/attachments/268763098616168448/727620075091263598/godzilla_corn.jpg for being so fascinatingly inexplicable]].
** From the dub; "''I think it stinks!''". And of course, the infamous speaking scenes between Godzilla and Anguirus.
* NarmCharm: Like many Showa-era Godzilla movies, this one is most definitely not a cinematic masterpiece but it has its ''moments''. Fans really seemed to like Gigan himself, and the climatic battle (when its not using StockFootage) has some memorable moments such as the ample amounts of bloodshed and Anguirus's FriendshipMoment.
* SpecialEffectFailure:
** At the Sagami bay sequence, Anguirus's mouth doesn't move even once, thus ruining its sound effects.
** During King Ghidorah and Gigan's entrance, they are clearly completely stiff toys.
** When Gigan steps on a car, it is clearly a toy car.
** The Godzilla suit, [=SoshingekiGoji=] (which had been made in 1968 for ''Film/DestroyAllMonsters'' and used in subsequent films up to this one), was in such bad shape that it was visibly falling apart - pieces can even be seen flying off in some scenes!
** King Ghidorah's suit, being the only one made during the first half of the Showa era and having already been in three previous films, was in pretty bad shape as well. In all of its non-stock footage scenes it's very still most of the time with only some slow head movement to prevent it from falling apart during filming.