The following are {{Trivia}}l facts relating to Anime/TheBigO.
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* ActorAllusion: [[Creator/SteveBlum Roger's]] first lines in the episode "Leviathan?" "I'd say you have the wrong guy; [[Anime/CowboyBebop I'm not exactly a bounty hunter.]]"
* AdoredByTheNetwork: In terms of anime that [adult swim] actually likes, it ranks up there with ''Cowboy Bebop'' and ''FLCL''. Not only did they co-produce the second season (thus granting [adult swim] permanent airing rights to it), but they've aired it enough times to make back the season's budget several times over. On the other hand, the first season hasn't been aired even once since back in the early 2000s, though this can be chocked up to the show falling into limbo after Bandai ceased production.
* AnimeFirst: Anime -> Manga -> Second season. As a result, some ideas from the (considerably darker) manga end up in the second season.
** The second season was then followed up by more Manga (unreleased in the US), with the purpose of tying up the manga continuity with the previously aired season.
* HeyItsThatVoice
** In the English dub:
*** [[Creator/RobertAxelrod Colonel Gaust]] is [[Series/MightyMorphinPowerRangers Lord Zedd, Finster]] and [[Anime/DigimonAdventure02 Armadillomon]] as well as [[Franchise/{{Digimon}} Wizardmon]]!
*** [[Creator/SteveBlum Roger Smith]] is [[Anime/CowboyBebop Spike]] and [[WesternAnimation/WolverineAndTheXMen Wolverine]]
*** [[Creator/WendeeLee Angel]] is [[Anime/CowboyBebop Faye]]
*** [[Creator/CrispinFreeman Alan Gabriel]] is [[Anime/CowboyBebop the answering machine!]] (And [[Manga/{{Hellsing}} Alucard]])
*** Dorothy is [[Anime/SerialExperimentsLain Chisa Yomoda]]
*** Dan Dastun is [[WesternAnimation/WolverineAndTheXMen Sabretooth]]
*** Beck is [[Manga/OutlawStar Gene]]
*** Schwarzwald is [[Anime/CodeGeass Emperor Charles Vi Britannia]]
*** In the [[TheOtherDarrin second season]], Norman is [[WesternAnimation/HeManAndTheMastersOfTheUniverse1983 Skeletor]].
** In the original Japanese:
*** [[Creator/AkikoYajima Dorothy]] is [[Anime/MobileSuitGundamWing Relena]]
*** [[Creator/UnshoIshizuka Alex Rosewater]] is ''[[Anime/{{Pokemon}} Professor Oak]]''.
*** [[Creator/TesshoGenda Dastun]] is [[Anime/MobileSuitGundam Sleggar Law]].
*** Norman is unsurprisingly [[Manga/{{Hellsing}} Walter]].
* [[KeepCirculatingTheTapes Keep Circulating The Tapes - Rescued]]: The rights to Big O were left hanging when Creator/BandaiEntertainment halted DVD production. Fortunately, {{Creator/Sunrise}} started auctioning their Bandai-owned shows to other distributors. As noted on the main page, ''Big O'' ended up in the hands of Creator/SentaiFilmworks.
* NoExportForYou: The second season has seen no release in European territories, and probably never will since Beez Entertainment has gone the route of [[Creator/BandaiEntertainment its parent company]] and stopped distributing animé titles.
* TheOtherDarrin: In the English dub of Season 2, Alan Oppenheimer replaced Milton James as the voice of Norman.
* ScrewedByTheNetwork: The reason the series has such a GainaxEnding is because Creator/AdultSwim told Sunrise that a third season was very likely. Sunrise decided to make Season 2's ending more ambiguous, expecting to have another season to explain things. Shortly thereafter Adult Swim decided to focus exclusively on comedies, and a third season was never funded.
* PhoenixWright looks similar to Roger Smith, except with a blue suit.
* The series has been featured in a few ''VideoGame/SuperRobotWars ''games, namely ''Z'' and ''Z2''.
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