* 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 SonicAdventure DX, and a brief crossover between this series Sonic X and Archie's Sonic comic (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.
* HeyItsThatVoice: In the Japanese version, [[Creator/SanaeKobayashi Chris]] sounds like a certain [[Manga/ElfenLied Diclonius.]]
* 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 nothing available 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 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.
* 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.
* 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]].
* TalkingToHimself: In Spain, Rafael Alonso Naranjo Jr. was Sonic and Vector.
** In English speaking territories, Jason Adam Griffith voiced both Sonic and Shadow.
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