* AdaptationFirst: The anime ''and'' manga were licensed and began release in English before the first novel was translated (about two years before and about half a year before, respectively).
** Averted with ''Disappearance'', the translated novel being released in November 2010 and the dubbed movie in Summer 2011.
*** Also (barely) averted with the Manga adaption too, the story covers Volumes 7-9 with Volume 9 being released ''weeks'' before the movie.
* ImageSong: Every named female character (plus Kyon's sister), Kyon, Itsuki, and Taniguchi have either one or two, plus a personal rendition of the DancingTheme (though not Taniguchi, who was second season only). It's a little ridiculous.
* GenderFlip: A non-authorised but ''extremely'' popular fan project, unofficially known as ''FanFic/SuzumiyaHaruhiNoSeitenkan'' ("The Genderflips of Haruhi Suzumiya").
* HeyItsThatVoice: The English dub cast reads like a veritable who's who of English voice talent:
** The SOS Brigade includes [[Manga/AiYoriAoshi Tina Foster]] (Wendee Lee/Haruhi), [[Anime/GhostInTheShellStandAloneComplex Togusa]] (Crispin Freeman/Kyon), [[StreetFighter Crimson Viper]] (Michelle Ruff/Yuki), [[Manga/{{Naruto}} Hinata Hyuuga]] (Stephanie Sheh/Mikuru), [[PowerRangers the second Black Ranger, Adam Park]], [[Manga/{{Bleach}} Ichigo Kurosaki]], [[Anime/CodeGeass Lelouch vi Britannia]], and [[{{Trigun}} Vash the Stampede]] (Johnny Yong Bosch/Itsuki).
** Their classmates include [[Manga/AhMyGoddess Belldandy]] (Bridget Hoffmann/Asakura), [[SamuraiChamploo Fuu Kasumi]] (Kari Wahlgren/Tsuruya, as well as Kyon's sis), [[WesternAnimation/TeenageMutantNinjaTurtles2003 Donatello]] (Sam Riegel/Taniguchi), [[OutlawStar Jim Hawking]] (Brianne Siddall/Kunikida), [[DigimonTamers Henry Wong]] (Dave Wittenberg/President of the Computer Club), and [[WesternAnimation/TeenTitans Starfire]] (Hynden Walch/Emiri).
** On the island we have [[OuranHighSchoolHostClub Tamaki Suoh]] (Vic Mignogna/Yutaka), [[Anime/GhostInTheShellStandAloneComplex Saito]] (also Dave Wittenberg, who plays Keiichi) and [[Anime/TheBigO Alex Rosewater]] (Michael Forest/Arakawa).
** The Japanese voices are as hilarious: Haruhi is voiced by AyaHirano, who also voiced [[LuckyStar Konata Izumi]] (who cosplayed ''and'' imitated Haruhi in an episode; Lucky Star is well-known for making at least one Haruhiverse reference per episode), and Mikuru shares a voice with [[BandageBabe bandage babe]] [[DeadpanSnarker deadpan snarker]] [[SayonaraZetsubouSensei Abiru Kobushi]] (YukoGoto).
*** And with a little mind twist you realize [[AyaHirano Haruhi]]'s seiyuu voiced [[Manga/DeathNote Misa Amane]], the love rival of [[MaayaSakamoto Kiyomi Takada]], whose seiyuu voiced… [[OuranHighSchoolHostClub Haruhi]]. You can't invent it.
** [[YukiMatsuoka Tsuruya-san]] is [[Manga/AzumangaDaioh Osaka]] and [[Manga/{{Bleach}} Orihime]]… not quite at their level of CloudCuckooLander-ness but it sounds strangely appropriate.
** Italian dub? Haruhi is either [[WesternAnimation/AvatarTheLastAirbender Azula]], [[WhatsNewScoobyDoo Daphne]] or [[SonicX Rouge the Bat]] (Domitilla D'Amico), Kyon is [[TransformersFilmSeries Sam Witwicky]], [[WesternAnimation/TotalDramaIsland Cody]] and [[Anime/CodeGeass Suzaku]] (Davide Perino), Mikuru is [[Anime/TengenToppaGurrenLagann Yoko]] and [[LovelyComplex Risa]] ''[[LovelyComplex Koizumi]]'' (Valentina Favazza), Nagato is [[Anime/ExcelSaga Hyatt]] (Perla Liberatori) and Koizumi can be either Manga/{{Naruto}}, [[DigimonTamers Terriermon]] or [[WesternAnimation/TeenTitans Beast Boy]] (Leonardo Graziano).
* KeepCirculatingTheTapes: The 2004 manga was only released [[NoExportForYou in Japan]], and only saw a limited print run, to where a physical copy is hard to find even ''with'' the help of the internet. The artist of this particular iteration got fired, either due to the artist drawing and selling unauthorized {{Hentai}} for the series he was drawing for, or the artwork seen in this series being less than stellar (most likely the latter). Either way, the publisher [[OldShame would rather forget it ever existed]], going as far as to commision a completely new manga series to another artist rather than reprinting this one once the Anime got popular.
* NoExportForYou: The various {{Licensed Game}}s were never released outside of Japan. Then there's the 2004 manga, for reasons stated above.
* OldShame: The 2004 manga. See KeepCirculatingTheTapes above.
* WhatCouldHaveBeen: Originally, Kyon was going to be an esper, but Tanigawa felt that ''Melancholy'' worked better with him as an ordinary student.
** Dub only: For the second season's [[GroundhogDayLoop Endless Eight]] arc, Bandai considered turning it into a GagDub, with the voice actors switching characters, or doing each episode with a different accent. Unfortunately, they decided to do a straight dub instead, even though Crispin Freeman gets to improvise some lines.
* Officially it's ''The Disappearance Of Haruhi Suzumiya'' in the English market; Japanese materials, however, are inconsistent on whether to use "''Disappearance''" or "''Vanishment''" as the translation.
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