* CrossDressingVoices: Creator/MikePollock voices Ella in the English dub.
* ExiledFromContinuity: Despite being very similar to the games in story and characterization, specific elements created for the series are not allowed to be used in other Sonic continuities due to copyright issues. The closest exception was a cameo of the series promo art in an optional side quest in ''VideoGame/SonicAdventure DX'', and a brief crossover between this series ''Sonic X'' and ''ComicBook/ArchieComicsSonicTheHedgehog'' (the former being a series that was given a legally mandated embargo on using elements from several ''Sonic'' series, including ''Sonic X'', and an event that is likely the reason why Sega will not allow Archie to reprint their ''Sonic X'' comics).
* FanNickname: Cosmo's species never really had a nickname until someone nicknamed them "Seedrians" for their plant like features.
* {{Feelies}}: The "Project: Shadow" DVD included a card from the ''Sonic X'' card game.
* KeepCirculatingTheTapes: The show aired reruns for a ''long'' time. Despite this, according to Ian Flynn, {{Creator/Sega}} [[ExecutiveMeddling apparently doesn't want]] [[ComicBook/SonicX the comics based on the show]] [[ExecutiveMeddling to be reprinted]], if some sources are to be believed.
** The show may have stayed alive through television reruns, but when it came to DVD releases, there was only incomplete releases from 4kids and Funimation until Creator/DiscotekMedia decided to license the show for a DVD release. Even still, Discotek currently only has plans for releasing the 4Kids dub [[note]]This is due to 4Kids themselves not supplying the scripts for the subtitled version that was streamed on Hulu, meaning that a sub-only (or even a re-dub based on the Japanese subs) release would require ''a complete recreation from scratch''[[/note]], meaning those who are hoping for an uncut release are out of luck, or at least will have to wait until Discotek decides to put out such a release, or until they give the license to someon else, like Website/{{Crunchyroll}}.
* NoExportForYou: Inverted? The last season only aired ''outside'' Japan, despite a full Japanese voice track being produced.
* TheOtherDarrin: Unlike the games in 2003, the Anime featured different voice actors from the Creator/FourKidsEntertainment line up such as Creator/JasonGriffith as Sonic and Shadow, Amy Palant as Tails, Creator/DanGreen as Knuckles, Creator/LisaOrtiz as Amy, and Creator/MikePollock as Dr Eggman. They would later replace the game voices as the official voice cast until 2010, when all but Mike Pollock would be replaced with the current voice cast.
** While most of the Japanese actors were retained from the games series, Creator/JojiNakata did not reprise E-102 Gamma (despite providing voice work for Dark Oak). Instead Naoki Imamura (who voices E-123 Omega in the games) took the role.
* SheAlsoDid: Chris's voice actress, Creator/SuzanneGoldish, would also go on to direct a few anime dubs with the L.A-based Creator/{{Studiopolis}}, including ''Manga/{{Bleach}}'', ''Anime/{{K}}'', and ''Manga/SailorMoon'' (2014 re-dub).
* TalkingToHimself: In Spain, Rafael Alonso Naranjo Jr. was Sonic and Vector.
** In English speaking territories, Jason Adam Griffith voiced both Sonic and Shadow.
* TheyJustDidntCare: Directed towards 4Kids's English dubbing of the series. Many of the key elements that are present in the Sonic franchise were often either misinterpreted or mislabeled in the 1st season (prime example was "Chaos Control" being mistaken for the name of Eggman's base, when in actuality it is when Sonic or Shadow use the Chaos Emeralds to teleport between Time and Space). This is mainly due to the dubbing cast OR crew members not bothering to do their research. Michael Haigney, the producer of the English dub, was reported to have said in an interview, "I've never played the game, seen the series or read the comics".
* WhatCouldHaveBeen:
** ''Sonic X'' originally looked like [[http://www.youtube.com/watch?v=L7AqlIp5evA this]].
** While not too different from the how the show actually turned out, there were a few elements that were definitely scrapped or changed from [[http://www.youtube.com/watch?v=7L7ti-tw8ro&feature=related the second pilot]].
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