* AnimeFirst: A manga adaptation began before the anime aired, but the manga's designs and characterizations are different from the anime's and the series was conceived as an anime first and foremost.
* CopiouslyCreditedCreator: In the English dub, Matt Greenfield was the ADR director and scriptwriter, as well as its producer.
* CrossDressingVoices: In the episode 15 flashback, Itsuki Kisaragi and Makoto Isshiki's younger selves were respectively voiced by Creator/AkikoHiramatsu and Creator/RomiPark.
* DescendedCreator: Ichiko Hashimoto was both Maya Kamina's voice actress and also the series' music composer.
* DirectedByCastMember: In the German dub, Susanna Sandvoss is Haruka Shitow's voice actress as well as one of the ADR Directors.
* LateExportForYou: ''[=RahXephon=]'' didn't reach Italy until 2004, with only the first five episodes dubbed.
* PlayingAgainstType: Creator/JojiNakata traditionally plays villainous roles. Kunugi is certainly ''antagonistic'', but isn't a villain. [[spoiler: And he gets better]].
* RealLifeRelative: Composer Ichiko Hashimoto co-wrote the ending theme with her sister Mayumi Hashimoto.
* ReferencedBy: ''[=RahXephon=]'' made its ''VideoGame/SuperRobotWars'' debut in ''VideoGame/SuperRobotWarsMX'', sharing both a roster and plot significance with ''Anime/BraveRaideen'' (its main inspiration) and ''Anime/NeonGenesisEvangelion'' (the show which fans often compare it to). To this day, ''MX'' is the only ''Super Robot Wars'' game in which ''[=RahXephon=]'' has appeared.
* RomanceOnTheSet: During the English dub's production, Kim Hotaru's voice actress Creator/TiffanyGrant married ADR director/scriptwriter Matt Greenfield. They have since divorced.
* StudioHop: At first, the North American home video releases were handled by Creator/ADVFilms, before switching to its successor Creator/SentaiFilmworks.
* UnfinishedDub: In Italy, Shin Vision dubbed and released the first five episodes on two [=DVDs=] in 2004. However, no additional volumes have been released since then.

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