* ActorAllusion:
** Thinking back to when Yusei ordered milk at a bar, guess who else did the same in the [[http://www.youtube.com/watch?v=xaeprg0vpZk music video]] of RUN&GUN's "Believe"?
** Aki is a possible case of this for her [[VoiceActors voice actress]], Ayumi Kinoshita. Look her up on TheOtherWiki and one of her few other roles is Jasmine of ''Series/TokusouSentaiDekaranger'', who also has psychic powers.
* AnimeFirst: While the original ''Yu-Gi-Oh!'' and ''Yu-Gi-Oh! [=ZeXal=]'' both had a manga before the anime, 5D's took the GX route and did not get one until over a year after the anime premiered.
* BadExportForYou: Present in the ''Tag Force'' games, wherein the export removes the voiced content and has glitches not present in the Japanese version (such as in ''Tag Force 5'', where the Machine Emperor's summoning cinematic won't register in the photo gallery).
* CelebrityVoiceActor: Notable examples of celebrities starring in this show are actor/singer Yuya Miyashita as Yusei and model/actress Ayumi Kinoshita (who's better known as [[Series/TokusouSentaiDekaranger Marika 'Jasmine' Reimon/Deka Yellow]]) as Aki.
* CrossDressingVoices: Both Rua and Lucciano are voiced by women.
* ExecutiveMeddling:
** Crow was intended to be a ''villain'', and the FinalBoss of the Dark Signer arc. However, his Blackwing cards in real life sold very well, so he was quickly rewritten as a protagonist and worked in the story as such. This resulted in Rua's role in the story being reduced, and the intention for him to get his Signer Dragon and become the Fifth Signer was dropped until the end of the series so Crow could be the Fifth Signer.
** In 2015, news came out that the reason for a lot of the plot changes made in Season 2 could be attributed to the same, strange reason. Carly's season one voice actress was discovered to be a member of a dangerous cult that was under investigation in Japan at the time, which led to her being fired and the production staff panicking to cover up anything [[TooSoon that might make the series seem pro-cult]]. Thus, Yliaster was retconned to being founded not by mystics in the past but time travelers from the future who went ''back'' to the past, Carly's entire arc was excised and she was DemotedToExtra, and the Psychic Duelists, who ''were'' actually a cult, simply vanished without explanation, leaving poor Aki without a plot of her own for the majority of the second season.
* FanNickname: Nearly every character has one, as do some inanimate objects and plot devices. See its section on the FanNickname page for more.
** Probably the most famous is [[AnimeHair 'Crabhead']] or the phonetic "Yousay" for "Yusei". The fact that an insert song is called Yousay may or may not be a ShoutOut to the fan name.
** Some people called out Aki as [[CodeGeass Kallen]] for their similar appearance.
** Game Sue and Hat Guy for the main character of the various games, because he usually takes the place of an established character (such as Crow in ''Over the Nexus'') and sidelines the rest so that you can be the one to beat the bad guy.
** "Bitchboots" for Placido, because of his CombatStilettos.
** "Fudo bitchslap", for the times when Yusei and his dad use GetAHoldOfYourselfMan.
** "Rexpositions" for Godwin's role as MrExposition.
** Carly's [[SuperpoweredEvilSide Dark Signer self]] is commonly referred to as "D-Carly".
** "The Tenors" for Yliaster, thanks to their ThemeNaming.
** Robo-Shrimp. [[PlotTwist Random]] [[ShockingSwerve Hobo]] [[FauxShadow Z-One]] and Best Yusei Cosplayer. All for Z-One.
* HeyItsThatVoice:
** Especially prominent in the dubbed version, since 4kids recycles their actors a ton. We have Yusei as [[Anime/YuGiOh Tristan]], Jack Atlas as [[Anime/YuGiOh Bakura]], Ushio is [[Anime/YuGiOh Yami]], and (early on) Rex is [[Anime/YuGiOhGX Saiou]] and [[Anime/YuGiOh Grandpa]]. Aki's VA is also Mai Valentine's [[TheOtherDarrin Season 4 voice]], and the Dark Magician Girl ([[MsFanservice notice a trend?]]).
** Aki's Japanese voice is [[Series/TokusouSentaiDekaranger Jasmine]].
** Jack Atlas's Japanese one is [[Anime/GunxSword Van]] and [[Anime/YuGiOhGX Honest]].
** Takasu is [[Anime/PantyAndStockingWithGarterbelt Garterbelt]].
** [[Creator/MasayaOnosaka Harald]] is [[TengenToppaGurrenLagann Leeron]]. [[BrainBleach You will never look at Harald the same again.]]
** Rudger is [[VideoGame/StreetFighterIV Akuma]], [[VideoGame/MarvelVsCapcom3 aka]] [[VideoGame/StreetFighterXTekken Gouki]].
** The German dub also recycles some voice actors from previous series. Most notably, Divine gets the voice actor of the little Yugi. Of course, German fans love Kiryu's German voice. It's freaking [[Manga/DragonBall Son Goku]]!
** In Episode 85 'Mother Knows Best', Zora's son, Lyndon, is voiced by [[Series/TheFlash2014 Robbie Amell]].
* IKnewIt: One of the many EpilepticTrees surrounding the Tenors, and was revealed to be true in the anime, [[spoiler: was that the three are the same being, each of them representing a period in the life of the same person. They are, and they do, and that person is Aporia]].
* KeepCirculatingTheTapes: For the dub version, since 4kids lost the license to it. Thanks in part to no DVD dubbed releases outside of a few Australian [=DVDs=] and the online streaming episodes at Toonzai and Hulu that may be removed.
* {{Jossed}}:
** A rather memorable one was the popular theory about Rex [[spoiler: being the Fifth Signer. Jossed in Episode 57 when it was confirmed that his brother, Rudger, originally had the Head mark. Interestingly the joss doesn't last long, as Rex takes on the Head for himself in Episode 62. Along with all the other birthmarks.]]
** The more epic joss came much later when Z-One's identity was revealed [[spoiler: to be a random scientist guy who took on Yusei's image, not Yusei himself]]. Fans were bitter.
* MarthDebutedInSmashBros:
** In America, ''Reverse Of Arcadia'', one of the video games that roughly follows the entire Dark Signer arc, was released before the last four episodes of said arc were dubbed. This spoils [[spoiler: Divine's second death, Rex becoming a dual Signer, and the entire DS finale]] for dub watchers. Oops.
** Not to mention the [[spoiler:Heart birthmark]], which Rua would receive ''over a year later'' in Episode 142. [[note]]''Reverse Of Arcadia'' was released in Japan the day after Episode 97 had aired over there.[[/note]]
** [[spoiler:Dark Signer Godwin]] appeared in ''WC 2010'' months before they did in the English anime, as well as a few minor characters in early Season 3. The same goes for Crashtown!Kiryu in ''Tag Force 5''.
* MemeAcknowledgment: [[http://twitpic.com/34lcdk This little image]] on 4Kids' site references [[WebVideo/YuGiOhtheAbridgedSeries CARD GAMES ON MOTORCYCLES!]]
* NamesTheSame: Kiryu shares the same name as a [[Film/GodzillaAgainstMechagodzilla certain mecha monster built upon 1954 Godzilla's bones.]]
* NoExportForYou:
** The OVA, which debuted the game's new Buster (Assault Mode in the TCG) cards.
** 4Kids has now chosen to skip dubbing Episodes 111-122, and to not dub any episodes after 136, so they can move on to Anime/YuGiOhZEXAL. This leaves a lot of questions unanswered, such as the identity of the being who gave Yusei his Shooting Star Dragon, and what the Divine Temple (Ark Cradle in the Japanese version) actually is. The prior episode skipping also means Jack simply pulls Red Nova Dragon out of his ass with no explanation during the duel with Team Ragnarok. Luckily, 4Kids has indicated they will release the undubbed episodes subtitled on Hulu.
** ''Tag Force 6'' debuted waaay back in 2011. Neither hide nor hair has been seen of an English release.
* RealitySubtext: At the time of the show's airing, the Roma Sophie cult was grabbing some headlines in Japan. Carly's voice actress, Li-Mei Chiang, was connected to them, which led to her being fired. This influenced the near-complete jettisoning of any occult aspects from the series after the Dark Signer arc.
* RelationshipVoiceActor: We know that Yusei and Kiryu are friends. And they were best friends before the bad stuff happened to Kiryu. Their German voice actors are Wanja Gerick and Tommy Morgenstern, who voiced [[Manga/DragonBall Krillin and Son Goku]], respectively.
* [[ScrewedByTheNetwork Screwed By Network Collapse]]:
** While the original Japanese airings avoided this, getting a consistent timeslot and never going on hiatus, the dubbed American airings weren't so lucky. First appearing on the CW Saturday morning block, its timeslots constantly changed around, airing as early as 7am or as late as almost noon. It also went on hiatuses often, and refused to air certain episodes due to sensitive content. Finally CW stopped airing it since DM proved to get better ratings. ''5D's'' did a ChannelHop to Cartoon Network, but its problems didn't end there. Episodes aired at 8am on weekdays, a time when most of the target audience would be attending school. New episodes updated randomly and one had to check the 4kids website to find the latest episodes. Oh, and streaming episodes are only available for Americans. And ''then'' the 8AM timeslot was reserved for reruns of Anime/{{Pokemon}}. Back to the CW.
** Due to a major lawsuit filed by TV Tokyo and Nihon Ad Systems for a debt exceeding '''''$4.5 million''''', 4Kids ''had'' to stop the dubbing process in its tracks and file bankruptcy. It's a rare, wild case where a network didn't exactly screw the program- they lost the rights and resources to air it.
* TalkingToHimself: In the dub version Harald and Jack are voiced by the same person, Ted Lewis, and spend pretty much the entire Ragnarok exposition episode like this.
* TheOtherDarrin:
** Carly's Japanese VA from Episode 130 onwards was replaced, due to an unrelated issue that caused her to quit.
** In the English Dub, Rex received a new voice from Episode 15 onwards, because of the tragic death of his VA, Creator/MaddieBlaustein. Crow's voice switched from Christopher C. Adams to Tom Wayland starting in Episode 94.
* TooSoon: [[spoiler:The tornadoes Placido created in his duel with Yusei are completely absent in the dub, due to the recent tornadoes disaster in the Midwest]].
* WhatCouldHaveBeen:
** In Takahashi's original design notes for Crow he's more of a Team Rocket figure, described as constantly trying to steal Yusei's D-Wheel and always failing (and then eventually befriending Yusei at some point).
** To add to the above, one of the writers have confirmed that Crow was intended to be the final boss of the Dark Signer arc.
** The original [[http://i.imgur.com/mDSK0.jpg fifth signer and his dragon]].
** Mukuro Enjo was apparently a [[http://yugioh.wikia.com/wiki/Hunter_Pace#cite_ref-ep_149_3-0 teammate]] of Yusei and Aki, and won the ''Pegasus J. Crawford Cup Trinidad Riding Duel Grand Prix'' with them in Z-One's original timeline!
** It was originally planned for Rua to get his Signer Dragon during the Dark Signer arc.