When U.S. producer John Beck was not satisfied with ''King Kong vs. Godzilla'', he and to a greater extent, his team of writers and editors tried to "fix" the film in the best ways they could: Chopping away scenes that actually made the characters a bit dimensional, adding in boring, pace halting segments of UN personnel explaining what's been cut out, shifting scenes and shots beyond recognition, sometimes less than logical dialogue changes, and finally, the near complete removal of Akira Ifukube's wonderful compositions. In terms making it feel like a completely different film, they succeeded, as the end result is much more akin to American Sci-Fi of the time, with most if not all satirical elements from the original cut excised, though the lighthearted tone and comedy scenes are kept.

Although it's still positively received in most circles, the original cut is almost always regarded as entirely superior, but unfortunately, this is version seen in most parts of the world. At the beginning of production, John Beck and Universal were given exclusive rights to the film throughout the Americas, Britain, Central Europe, Israel and so on. The Japanese version has never been given a stateside release and probably never will. Contrary to what some people would believe, most of the people involved in the Americanization actually ''did'' have a great deal of respect for the original material, and like how ''Film/GodzillaKingOfTheMonsters'' was handled, they believed their version would be more suited for American audiences.
!!Tropes exclusive to the U.S. version:
* ArtisticLicensePaleontology: Dr. Arnold Johnson, curator of the New York Museum of Natural History, classifies Godzilla as a dinosaur "possibly crossed between the tyrannosaurus and the stegosaurus". A carnivore and a herbivore separated by millions of years of evolution can interbreed? What!? Made worse when the doctor holds up a children's dinosaur book to support his theories. It seems he couldn't even afford a copy of ''[[Film/GodzillaRaidsAgain Anguillosaurus, Killer of the Living.]]''
* ContinuityReboot: Despite a helicopter pilot clearly identifying the monster, the U.S. version ignores the previous two films completely (also note that ''Gigantis'' wasn't really considered a Godzilla film in those days for obvious reasons), presenting Godzilla as a generic frozen dinosaur with no connections to the H-Bomb.
* CutAndPasteTranslation: Where to begin... The infamous "corns" exchange only serves to coverup the fact that the scene has been shifted. In the Japanese version, Farue is talking about Godzilla's sudden return, which took place ''after'' the expedition party reached Faro Island.
* HeyItsThatVoice: James Yagi appears in person as Yutaka Omura after previously dubbing characters in ''Film/{{Rodan}}'' and ''[[Film/GodzillaRaidsAgain Gigantis]]''.
* NukeEm: This standard B-movie plan is considered by the authorities, but is dropped in favor of the film's title. This is also touched upon in the Japanese cut, albeit more briefly. It should be noted that during the first scene with Shigezawa (which was shifted ''before'' Godzilla attacks the army base), he is talking about how no one should really be surprised about Godzilla's return, and the references to the 3000 year old lotus seed and the ancient frog are put in Johnson's mouth instead in the U.S. cut.
* NoPronunciationGuide: Every dub actor repeatedly pronounces Hokkaido as "Hokkai-yaddo". The only individual to pronounce it properly is James Yagi during the added U.N. scenes.
* RecycledSoundtrack: With Ifukube's score almost entirely out of the picture, [[Film/CreatureFromTheBlackLagoon the Gillman's]] three note leitmotif now serves as both monsters' theme. Some cues go back as far as 1941's ''Man-Made Monster''.
* SameLanguageDub: The original voices of the Seahawk's crew were not retained and Harold S. Conway was given a foreign accent for whatever reason, [[Film/TheMysterians again]]. A bit of dialogue changes occur too: In the Japanese version, the captain utters "Oh my god" after the engine fails, while in the dub he says [[{{Bowdlerise}} "Oh, great"]] instead. The helicopter pilots' dialogue was changed as well.
* StockFootage: In addition to the U.S. produced scenes, footage lifted from ''Film/TheMysterians'' is thrown in for good measure. The invaders' otherworldly orbiting mothership stands in for the U.N.'s International Communications Satellite, scenes of panicking civilians obviously not tinted to match the rest of the scene pad out Kong's rampage through the suburbs, and by far the most notable usage occurs during the ending, where scenes of entire villages sinking into the ground and tidal waves flooding valleys were used to make Godzilla and King Kong's fall into the water and the following tremor seem more climactic.

!!Tropes exclusive to the Japanese version:
* {{Retool}}: Ishiro Honda originally did not want the monsters in a LighterAndSofter approach, as most of his kaiju films are serious in nature. From this film onwards, he chose to not direct anymore films after ''Film/TerrorOfMechagodzilla''.

!!Regular Trivia Tropes:
* DuelingDubs: In addition to the U.S. cut, there's supposedly an uncut international English dub produced in either Tokyo or Hong Kong out there somewhere, but it's never surfaced and is feared lost. [[https://www.youtube.com/watch?v=S_8UqHprBus The trailer still exists though]].
* NoExportForYou: The original Japanese version has never been released in the United States.
* WordOfGod: According to Creator/{{Toho}} Studios, the winner of the battle is [[spoiler: King Kong.]]
* WhatCouldHaveBeen: Almost immediately after the release of this film, there were plans to do a sequel, simply entitled ''Continuation: King Kong vs. Godzilla.'' Unfortunately, the idea didn't get far, and very few details are known as to how the film would've turned out.
** There were also plans to remake the film as part of the Heisei Godzilla series to coincide with Toho's 60th anniversary. Due to ExecutiveMeddling on the part of the rights holders for Kong, the film instead became Film/GodzillaVsKingGhidorah.