* CrossDressingVoices: Creator/MikePollock voices Ella in the English dub.
* 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.
* 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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