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* ActorAllusion:
** Para-Medic calls Snake "a real Captain Nemo" after he states that his name is John Doe. Creator/AkioOhtsuka, the Japanese voice actor of Snake, had previously voiced Captain Nemo in the anime series, ''Anime/NadiaTheSecretOfBlueWater''.
** Volgin shares some traits with Raoh, including unusual powers and being military dictators. Both Volgin and Raoh were voiced by Creator/KenjiUtsumi. Also, this wasn't the only time Utsumi played [[Manga/DragonBall a tyrannical leader of an army with the word "Red" and "Army" in it.]]
** In the Japanese version of the game, the comical NonStandardGameOver messages from Colonel Campbell (when he berates you for creating a TimeParadox via killing Ocelot, EVA or Sokolov) is an allusion to Creator/TakeshiAono voicing Doc Emmett Brown in the Japanese dub of the ''Franchise/BackToTheFuture'' movies.
* CreatorBacklash:
** Done to Raiden from the previous game. Zero devotes a long radio conversation to the fact that the Raikov mask irritates him, and the mask is used to pose as Major Raikov, the impulsive, despised, and ill-tempered lover of everyone's favorite homicidal lunatic, Colonel Volgin; Snake beats him up and hides him in a locker, with the option of actually killing him. This pleased Raiden's substantial {{Hatedom}} to no end. [[RescuedFromTheScrappyHeap He got better]].
** In the Secret Theater video ''Metal Gear Raiden: Snake Eraser'', Raiden goes back in time to assassinate Naked Snake/Big Boss and take the role as the main protagonist for himself. He ends up, among other things, getting kicked in the face by Naked Snake during the HALO jump, and [[BlackComedyRape is almost raped by Volgin]], mistaking Raiden for Raikov.
** The ''VideoGame/{{Metal Gear Solid 4|GunsOfThePatriots}}'' trailer also takes a potshot at Raiden, with the crowd booing heavily when he unmasks himself and his getting royally creamed by Snake during their fight for the main character chair.
* DoingItForTheArt: As detailed below, Akio Ohtsuka was so ready to do all of Snake's dialogue in Russian that he took up language classes for it. However, his castmates found the idea crazy and it was dropped altogether.
* FakeNationality: British-born Neil Ross and American-born Creator/JimWard voice Russians. It should be noted that, due to TranslationConvention, both characters speak English in American accents.
* FanNickname:
** The river you "fight" The Sorrow in is often called the "River of Sorrow" by fans, for obvious reasons.
** The infamously long ladder climb after the fight with The End is jokingly referred to as the "Ladder Boss".
* IKnewIt: [[spoiler: Why would a hero whose motto is "loyalty to the end" betray her country? She says it herself near the beginning: "I didn't." That she's a FakeDefector never really crosses Snake's mind, but everyone playing the game expected that to be the case. That it doesn't turn out okay for The Boss in the end... that's the ''real'' nasty twist.]]
* RecursiveImport: Subverted. ''Metal Gear Solid: Integral'' and ''Metal Gear Solid 2: Substance'' had English voice acting with subtitles for their Japanese releases. However, the ''Subsistence'' edition of this game kept the Japanese voice acting for its native release, but still added all the other extra features from the European version.
* ScrewedByTheLawyers: Why the [[VideoGame/ApeEscape Snake vs. Monkey]] minigame isn't in the 3DS and HD versions. Sony Computer Entertainment created and owns the rights to ''Ape Escape'', killing any chance the minigame has of being on other consoles by default.[[note]]Though that doesn't quite explain its absence in the UsefulNotes/PlayStation3 and [[UsefulNotes/PlayStationVita Vita]] versions, except not wanting to bother putting extra effort into one version.[[/note]]
* ThrowItIn:
** Kojima wanted to use a piece of licensed music for the closing credits, and a colleague of his suggested he listen to the band stellastarr*. He misheard this as "Starsailor", and liked the track "Way to Fall", which ended up being used.
** During the scene where Snake and EVA are hiding in a mountain bolthole, when EVA leans in to kiss Snake, he pulls back. This was because Snake's motion capture actor for the scene wasn't used to doing love scenes and pulled back because he was nervous. Kojima, believing this was in character for Snake, decided to keep the scene in, and fondly remembers this as one of his favorite touches in the game.
* SoMyKidsCanWatch: The Snake vs. Monkey minigame in the game which is based on ''VideoGame/ApeEscape'' was partially made so that the developers with young children could share the game they were working on with their kids.
* WhatCouldHaveBeen:
** The credits theme was originally planned to be Music/DavidBowie's "Space Oddity" and "Ashes to Ashes" when space development was originally one of the game's main themes.
** As the player goes through the game, Snake's injuries were supposed to leave visible scars on him, but the UsefulNotes/PlayStation2's hardware capabilities were unable to handle this feature.
** During the torture sequence, there was going to be various button prompts that would have Snake struggle and swear, but the concept was ultimately cut.
** Kojima and Akio Ohtsuka proposed the idea of having the game be voiced in ''Russian''. By the ''Japanese voice cast''. Ohtsuka was so enthusiastic about the idea, he went for Russian lessons. The rest of the cast shot them down. Interestingly, he decided to revisit this idea and use actual Russian in ''VideoGame/MetalGearSolidVThePhantomPain''.
** ''The Naked Sample'' tech demo for the [=3DS=] showcased some significantly improved graphics, an updated sneaking suit design, and new set-pieces showing off the 3D capabilities of the [=3DS=] hardware. Unfortunately, the actual ''Snake Eater 3D'' is more of a straight port with updated textures and added game mechanics from ''Metal Gear Solid 4'' and ''Peace Walker''.
** The game was originally meant to be a UsefulNotes/PlayStation3 title, but it was released for the [=PS2=] instead when the former's development took longer than expected.
** The "Guy Savage" nightmare what Snake has was originally meant to be ''VideoGame/{{Gradius}}'', but Kojima thought that an original game was better suited for that part.
** It was originally intended that Colonel Volgin actually ''murdered'' his father which resulted in his inheriting the Philosophers' Legacy by consequence (thus making him a SelfMadeOrphan). However, the still that had him murdering his father was cut from the final version. Had it been kept, it should be noted that his reasons for murdering his dad most likely had nothing to do with the Legacy, as he himself admitted that he didn't even know about the Legacy's existence, or even that his father had it, until after his father's demise.
** Kojima looked at replacing Creator/DavidHayter as Snake with Creator/KurtRussell, who ultimately passed. Interestingly, Solid Snake was original based on Russell's character from ''Film/EscapeFromNewYork''.
** Early press releases stated that the player would be able to set traps for enemy soldiers, similar to the traps that the player must negotiate in the game. Also, there wouldn't be prescribed paths through the jungle, allowing for more freedom in navigation. These features were cut when the [=PS2=] was found to be unable to process these.

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