* [[ActorAllusion Actress Allusion]]: Solid Snake and Johnny Sasaki are reminded of Meryl Silverburgh when they see Olga Gurlukovich. There's a good reason for that. In the Japanese version, Meryl and Olga were both voiced by Kyoko Terase.
* ApprovalOfGod: While the VR theory was shot down by Creator/HideoKojima (see below), he included numerous nods of it in ''Metal Gear Solid 2: Substance'', particularly "External Gazer": While testing out Otacon's newest toy, a VR helmet, Snake is tricked into believing he's Raiden and starts to experience bizarre scenarios.
* HeyItsThatGuy:
** Kelly Brook, Carmen Electra and Louise Rednapp appear in the pin-ups in the initial release of the game. When it was re-released, Creator/{{Konami}} didn't re-license the images from ''FHM''.
** To a lesser extent, most of the game's music was composed by Harry Gregson-Williams.[[note]]He composed music for ''Film/{{Armageddon}}'' and ''Film/TheRock''.[[/note]] Kojima was inspired to have him compose the soundtrack after he and sound director Kazuki Muraoka saw ''Film/TheReplacementKillers'' in a cinema (Gregson-Williams had composed the music for that film as well) and found they enjoyed his compositions.
* HeyItsThatVoice:
** Creator/QuintonFlynn, who also lends his talents to [[WesternAnimation/JonnyQuestTheRealAdventures Jonny Quest]], [[Franchise/KingdomHearts Axel]], and [[VideoGame/NoMoreHeroes Henry]], among others, voices Raiden.
** Hey, Vamp was voiced by [[Film/PulpFiction Marvin]].
** Colonel Gurlokovich wants you to know that [[Franchise/{{Terminator}} killer machines from the future]] are just a figment of your imagination.
** Marine Commandant Scott Dolph is voiced by Creator/KevinMichaelRichardson, given that he and [[Creator/PhilLaMarr Vamp]] are stated to be lovers, it could potentially turn their respective characters' relationship on ''WesternAnimation/StaticShock'' quite [[ParentalIncest unsettling]].
** Solidus is actually [[VideoGame/KnightsOfTheOldRepublic Canderous]].
** Likewise, [[Creator/JenniferHale Naomi]] of the [[VideoGame/MetalGearSolid previous game]] returns as Emma, and would later share a game with Solidus's voice actor as Bastila Shan.
** Olga in the Japanese version is [[VideoGame/MetalGearSolid Meryl]] [[VisualNovel/{{Policenauts}} Silverburgh]], something that's even lampshaded in the game itself.
* {{Jossed}}: Give the ambiguity of Raiden's perceptions of realty and the bizarre ending, some fans hold that the entire game is a VR simulation gone berserk; the final pitched battle against the RAY army takes place on a platform which is identical to the one in the ''VR Missions'' expansion game. As of ''VideoGame/MetalGearSolid4GunsOfThePatriots'', this has been Jossed, though it's also been speculated that this interpretation was Kojima's ''original'' intention and he merely [[AuthorsSavingThrow buckled under fan pressure]] in between games. ''[[http://inception.davepedu.com/ *Inception horn*]]''
-->'''Raiden:''' There's pain sensation in VR, and [[ChekhovsLecture even a sense of reality and urgency!]]
* MeaningfulReleaseDate: At least one trailer pointed out that the game was released during the Chinese Year of the Snake.
* RealitySubtext: "[We should] let our children read our sad and messy history by its light," says Solid Snake. While the game was in production, there was a major controversy about the Japanese government whitewashing UsefulNotes/WorldWarII atrocities in school textbooks.
* TalkingToHimself: Solidus Snake and Solid Snake are both voiced by Creator/AkioOhtsuka in Japan, and they exchange lines during Raiden's first encounter with Solidus.
* TooSoon:
** The game was released shortly after 9/11, and as such a sequence where [[spoiler:Arsenal Gear crashes through Manhattan]] was severely chopped down. The game jump-cuts from Arsenal Gear accelerating down the Hudson River with the music swelling dramatically, to it having already reached Federal Hall.
** A line that also didn't make the cut thanks to 9/11 was one where Raiden claimed that "[[ItMakesSenseInContext the U.S. President is a terrorist]]" at a point after meeting him.
* WhatCouldHaveBeen:
** ''The Document of Metal Gear Solid 2'' reveals a variety of cut content from the game. For example, Snake was supposed to plant [=C4=]s on RAY (similar to his work with Philanthropy), not just take pictures. This sequence made it into ''[[VideoGame/MetalGearSolid3SnakeEater Metal Gear Solid 3]]'' during Naked Snake's sabotage of the Shagohod factory.
** In addition, the Tanker chapter was intended to end with an escape sequence as Snake tries to make it out of the tanker before it sinks, but the sequence was cut because play testers didn't think it was fun enough. Footage of the cut sequence is still used in the main game itself, in flashbacks.
** There were supposed to be two additional members of Dead Cell (Old Boy and Chinaman). In Chinaman's case, his boss encounter was in an area that was eventually used for the fight with Vamp.
** Raiden was also supposed to unlock a “Mantis Mode” where he can equip Psycho Mantis' gas mask and read the thoughts of [=NPCs=]. This sounds suspiciously like it was retooled into the directional microphone.
** Originally, Raiden's privates would have been exposed during combat inside Arsenal Gear, prior to meeting Snake, depending on the player's actions. It would have led to a game over.
** The scene of Arsenal Gear crashing into Lower Manhattan was cut due to 9/11: It was planned as a pretty brutal sequence, with [[MonumentalDamage Ellis Island and the Statue of Liberty]] being toppled like bowling pins (you can see why it wouldn't fly, even today). What isn't generally known, though, is that Snake was supposed to join Raiden for the finale, battling Liquid Ocelot ''and'' Solidus Snake as [[HoldingOutForAHero a crowd of rooting civilians and mounted policemen]] look on.
* WritingByTheSeatOfYourPants: ''Metal Gear Solid 2'' was intended to close the book on Kojima's involvement with the series, and it shows. Hence the labyrinthine plot {{left hanging}}, with no intention of ever resolving it. Kojima would walk into the office every day and [[http://www.hardcoregaming101.net/jb/jb.htm demand that each developer come up with a new idea]], which eventually birthed the bomb disposal sequence.
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