The following are {{Trivia}}l facts relating to Anime/TheBigO.
----
* 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.]]"
* 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 [[MightyMorphinPowerRangers Lord Zedd, Finster]] and [[Anime/DigimonAdventure02 Armadillomon]] as well as [[Franchise/{{Digimon}} Wizardmon]]!
*** [[SteveBlum Roger Smith]] is [[CowboyBebop Spike]] and [[WesternAnimation/WolverineAndTheXMen Wolverine]]
*** [[WendeeLee Angel]] is [[CowboyBebop Faye]]
*** [[Creator/CrispinFreeman Alan Gabriel]] is [[CowboyBebop the answering machine!]] (And [[{{Hellsing}} Alucard]])
*** Dorothy is [[SerialExperimentsLain Chisa Yomoda]]
*** Dan Dastun is [[WesternAnimation/WolverineAndTheXMen Sabretooth]]
*** Beck is [[OutlawStar Gene]]
*** Schwarzwald is [[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 [[{{Hellsing}} Walter]].
* [[KeepCirculatingTheTapes Keep Circulating The Tapes - Rescued]]: The rights to Big O were left hanging when BandaiEntertainment halted DVD production. Fortunately, {{Creator/Sunrise}} started auctioning their Bandai-owned shows to other distributers. As noted on the main page, Big O ended up in the hands of SentaiFilmworks.
* NoExportForYou: The second season has seen no release in European territories, and probably never will since Beez Entertainment has gone the route of [[BanDai 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.
* 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''
----