* AccidentalDownerEnding: At least on the dub side of things. Because season 4 was never dubbed by Creator/FourKidsEntertainment, the series ends with Jaden supposedly leaving Earth forever to stay bound to Yubel as he succumbs to madness. In addition they also imply Zane dies in this version from his heart failure. It wasn't until the dub of ''Anime/YuGiOhBondsBeyondTime'' where we even got close to the intended conclusion for ''GX'' for dub watchers. Season 4 would eventually officially be released in the West through Crunchyroll.
* ActorAllusion: Fubuki Tenjouin/Atticus Rhodes isn't the first character [[VideoGame/ShadowTheHedgehog associated with Red and Black]] that Creator/KojiYusa and Creator/JasonGriffith have both voiced. Similarly, Dr. Allbert Zweinstein is played by Creator/TakeshiAono, [[VideoGame/MegaManClassic and guess who else he played?]] [[note]] Dr. Wily himself [[/note]]
* AnimeFirst: Also, it's the first original ''Yu-Gi-Oh!'' anime series.
* {{Blooper}}:
** In episode 35 Slade and Jaeger state that Chazz can only use monsters with no more than 500 '''Lifepoints''' in their duel instead of attack points.
** In episode 143, The Supreme King uses "Dark Calling" against O'Brien/Axel, fusing "Elemental Hero Burstintrix" from his hand and "Elemental Hero Clayman" from his graveyard to fusion summon "Evil Hero Infernal Sniper". The problem is, at no point prior is The Supreme King shown actually ''sending'' "Clayman" to the graveyard, or even sending an unspecified card to the graveyard that might have been "Clayman".
** In the dub, Jesse mixes up attack points and life points several times. It's not called attention to, so it must be a mistake, but he does it almost once every duel.
* CrossDressingVoices: Both Sho and Johan are voiced by female seiyuus in the Japanese version.
* ExecutiveMeddling: Both the anime and the manga had the tail end of the series rushed due to the execs wanting to push out the newer ''Yu-Gi-Oh!'' series (''[=5D’s=]'' and ''ZEXAL'' respectively).
** This also affected the dub of GX, as Creator/FourKidsEntertainment was forced to CutShort their English dub of ''GX'' after the third season and skip ahead to dubbing ''Anime/YuGiOh5Ds'' at the behest of Japanese broadcasters who wanted the new series to get pushed to the West as soon as possible.
* FanNickname: Judai is often called "Judai Fusiones Locas" in the LATAM fandom due to his focus on fusion and being a reference to Yugi's own nickname in the LATAM fandom "Yugi Trampas Locas"
* FakeBrit: Bastion Misawa in the dub.
** Vellian Crowler leans towards this, but has more of a mid-Atlantic accent associated with Ivy League professors. In Japanese he was actually Italian.
** Lyman Banner is a Fake German in the dub.
* IncidentalMultilingualWordplay: One-shot character Anger Mask uses, as his key monster, a card called "Ikari no Anchor Knight", an armored warrior that fights with anchors as a VisualPun on the word "ikari" which can mean both "anchor" and "anger". The pun works almost as well in English, where "anchor" and "anger" are near-homophones.
* MissingEpisode: When Creator/PlutoTV began airing their ''Yu-Gi-Oh!'' Channel, some episodes of ''GX'' were missing. Episodes 11, 16, 19, 23, 29, 30, 36, 39, 46, 49, 56, 57, 59, 66, 105, and 150-155 are all skipped, with no real reason given.
* NoExportForYou: The fourth season has never been dubbed or released on DVD outside Japan.
** Seasons 2-3 have never been aired in Finland, even though the first season was aired in Finland. Then again, the original Duel Monsters series has never been aired in Finland either.
* TheOtherDarrin:
** ''Anime/YuGiOhBondsBeyondTime'' replaced [[Creator/CassandraLeeMorris Cassandra Morris]] from the anime with Eileen Stevens.
** Chazz and Alexis' English [=VAs=] were replaced later on.
** When Chumley reappears in Season 2, he's voiced by Tom Wayland, as opposed to his original voice actor, Ted Lewis.
** Eric Stuart does Para and Dox instead of Sam Riegel and Marc Thompson.
* SheAlsoDid:
** Jasmine's English voice actress, Creator/SuzanneGoldish, would also go on to direct a few anime dubs with the L.A-based Creator/{{Studiopolis}}, including ''Manga/{{Bleach}}'' (episodes 268-366), ''Anime/{{K}}'', ''Anime/KabaneriOfTheIronFortress'', ''Anime/TigerAndBunny'', and ''Manga/SailorMoon'' (2014 re-dub).
** Creator/MatthewLabyorteaux, Jaden's voice actor in the English dub, had previously done quite a bit of acting work outside of voice acting, his most well-known role being Albert Quinn Ingalls on ''Series/LittleHouseOnThePrairie''.
* RecastAsARegular: The series has a couple of examples in both languages:
** In Japanese, Sho is voiced by Creator/MasamiSuzuki, who in the original series voiced minor villain Bonz.
** In the dub, Creator/MatthewLabyorteaux voices Jaden Yuki, and previously voiced OneShotCharacter Johnny Steps in the original series.
* StarMakingRole: The anime happens to be Creator/{{KENN}}'s debut and breakout role.
* WhatCouldHaveBeen: ''[[http://yugipedia.com/wiki/Yu-Gi-Oh!_VS._GX Yu-Gi-Oh! VS. GX]]'' was a canceled movie that would have pit Yugi against Jaden.The Domino Field Trip mini arc in the second season was retooled from this concept and Yugi vs. Jaden would happen in the show's GrandFinale.
----