* BannedEpisode: The episode "Mass Transit Trouble" was stricken from the airwaves ''twice''. The first time was in the aftermath of the Oklahoma City bombing because of the episode's references to terrorism. The second time was during Creator/ToonDisney[='=]s run, in the aftermath of the September 11th attacks.[[note]]It should be noted that Toon Disney decided to {{Bowdlerize}} one scene where Sonic finds a bomb under a chair, so they knew that the episode had questionable material.[[/note]] The Toon Disney version of episode was circulating on Website/YouTube for a couple of years before the uncut episode was finally given a proper release on DVD, thanks to Creator/ShoutFactory.
* CreatorBacklash: According to Milton Knight, many of the staffers openly despised working on this show. Knight himself enjoyed working on it, but found the animation, writing, and most of the voice acting to be quite shoddy.
* DependingOnTheArtist Creator/{{TMS|Entertainment}}: As anyone can tell you, TMS did five episodes and the opening. However, due to ''Anime/FarewellToNostradamus'' and a smaller budget then what TMS normally got from Creator/WarnerBros [[WesternAnimation/{{Animaniacs}} on their shows]], the bulk of the animation was outsourced. Listed below are the animation directors and outsourcing units used during production.[[note]] Much like ''WesternAnimation/TinyToonAdventures'' and ''WesternAnimation/BatmanTheAnimatedSeries'', they were uncredited for the work.[[/note]]
** Opening: Creator/ToshihikoMasuda; In house.
** "Quest for the Chaos Emeralds Part 1"[=/=]"Blackbot the Pirate": Kazuhide Tomonaga; Creator/NakamuraProductions.
** "Quest for the Chaos Emeralds Part 2"[=/=]"Hedgehog of the Hound Table": Kenji Hachizaki; Creator/AnimeSpot.
** "Quest for the Chaos Emeralds Part 3"[=/=]"Robotnik's Pyramid Scheme": Atsuko Tanaka; Creator/{{Actas}}.
** "Quest for the Chaos Emeralds Part 4"[=/=]"Prehistoric Sonic": Toshihiko Masuda; Creator/StudioJungleGym.
** "Super Robotnik": Kenji Hachizaki (first half, left during production to work on ''Farewell to Nostradamus''), Yuichiro Yano (second half), Hiroyuki Aoyama (the ''Sonic Sez'' segment of the episode); in-house.
* DependingOnTheArtist ([[Creator/HongYing ot]][[Creator/RainbowAnimation her]] [[Creator/{{Saerom}} studios]]): The quality of the characters and animation as a whole tend to change between episodes.
* ExecutiveMeddling:
** ''Sonic Christmas Blast'' was originally intended to be titled ''An X-Tremely Sonic Christmas'' as a tie-in with the game ''Sonic X-treme'', but the game's cancellation forced it to be titled for ''Sonic 3D Blast'' instead.
** Dr. Robotnik was originally conceived as television's sexiest fat man. The animators weren't up to the challenge, but it didn't stop them from slipping in a lot of {{shirtless scene}}s and scenes that draw too much attention on Robotnik's rear end. This also includes the bikini pic from "Hero of the Year."
* FakeAmerican: Jaleel White was the only American voice actor. Everyone else in the cast was based in Vancouver. However, this is averted with Robotnik, since Long John Baldry made [[NotEvenBotheringWithTheAccent absolutely zero attempts to mask his native British accent]].
* HeyItsThatSound:
** The episode "Grounder the Genius" features two of the actual sound effects from the ''Sonic'' games[[note]] [[VideoGame/SonicTheHedgehog The]] [[VideoGame/SonicTheHedgehog2 first]] [[VideoGame/SonicTheHedgehogCD three]][[/note]] in one part of one scene; specifically, the "jump" and "ring" sound effects.
** One episode has [[http://www.youtube.com/watch?v=5V8In4rQqe0 Mario sound effects when Robotnik pushes a few buttons]]. This could be due to the fact that [[Creator/DiCEntertainment DiC]] also made the ''Mario'' cartoons, so they certainly had the sound effects on-hand already.
** One of the "running" sound effects (used in numerous other cartoons) would later be used as one of the sound effects when landing on a spring in modern ''Sonic'' games.
** The Mario sound effects later appear in "Attack of the Pinball Fortress".[[note]] the ''VideoGame/SonicTheHedgehogSpinball'' episode.[[/note]]
** The "derez" sound effect from ''Film/{{Tron}}'' can be heard in "Robitnik's Rival".
** The "spider" sound effect from ''VideoGame/{{Centipede}}'' can be heard in "Coachnik".
* IronyAsSheIsCast: Robotnik sings much worse than his voice actor, Long John Baldry.
* NamesTheSame: Christopher Stephen Welch shouldn't be confused with Christopher Evan Welch.[[labelnote:Explanation]]For a long time, Christopher Evan Welch was widely believed and credited for providing Tails' voice. When he died in 2013, many fans noticed that there was a discrepancy between his age and Tails' voice (he was 27 when ''Adventures of Sonic the Hedgehog'' first aired in 1993). It wasn't until 2014 when it was revealed that [[http://www.segabits.com/2014/04/15/the-real-adventures-of-sonic-the-hedgehog-tails-voice-actor-speaks-up/ Christopher Stephen Welch was the one who actually provided Tails' voice.]][[/labelnote]]
* TheOtherDarrin:
** In the unaired pilot, Dr. Robotnik and Scratch was voiced by Creator/JimCummings, while Tails' voice actor was uncredited. In the series proper, Robotnik was voiced by Long John Baldry, Scratch was voiced by Phil Hayes, and Tails was voiced by Christopher Stephen Welch.
** In ''Sonic Christmas Blast'', Tails was voiced by Chris Turner, instead of Christopher Stephen Welch.
** Princess Sally from ''[=SatAM=]'' appears in ''Sonic Christmas Blast'', but has no lines aside from gasps and moans. Sally's voice actress, Creator/KathSoucie, was under contractual obligations voicing Lola Bunny in ''Film/SpaceJam'' at the time, so her lines were written out and Creator/TabithaStGermain provided her vocal effects in the special.
* PlayingAgainstType:
** Coconuts' voice actor, Ian James Corlett, is also the voice of Mega Man in the Ruby-Spears cartoon. ''WesternAnimation/SonicUnderground'' didn't help either.
** [[{{Badbutt}} Sonic]] was voiced by none other than Jaleel White, who was also known for playing [[{{Nerd}} Steve Urkel]] in ''Series/FamilyMatters''.
* RetroactiveRecognition: During its run, the series ran a "Watch and Win Sweepstakes" contest. One of the two winners was a young boy named [[Webcomic/{{Sonichu}} Christian Weston Chandler]].
* TalkingToHimself: Katella and Mama Robotnik are both voiced by Kathleen Barr. When she was playing Mama Robotnik in "Zoobotnik", she made her voice lower and gruffer than she had sounded previously.
* WhatCouldHaveBeen:
** The cartoon was going to last longer, but it played the SixtyFiveEpisodeCartoon trope straight.
** There was a workprint of a pilot episode that was screened when the cartoon was being pitched to ABC. Unfortunately, the network hated it and instead preferred [=DiC's=] [[WesternAnimation/SonicSatAM second idea]] of a ''Sonic''-themed television series, ultimately leading to the pilot being scrapped. The workprint itself can be seen on [=YouTube=]. The work print also has some noticeable differences from the final product. Robotnik and Scratch are voiced by Jim Cummings, a narrator plays throughout the action and there is slightly more authenticity to the games themselves with zones and badniks seen in far more recognizable form.
** The series' [[http://ledastudios.rubberslug.com/gallery/master_query.asp?SeriesID=33783 writers' bible]], in an attempt to establish a connection with the [[{{WesternAnimation/SonicSatAM}} successful Saturday morning cartoon series]] airing at the time, claims that this series is a {{Prequel}} to ''[=SatAM=]'' that takes place before Robotnik conquered Robotropolis and sent Sonic into hiding in Knothole,[[note]]See "Page 6 - Sonic, part 4".[[/note]] insinuating that this is the same Sonic, Tails and Robotnik inhabiting the same world rather than [[AlternateContinuity Alternate Continuities]]. It's uncertain if this detail was ever actually intended to be explored in the plot of ''[=AoStH=]'', or if it was merely included as a direction so that writers would acknowledge that the two shows have different settings and not confuse them, but nevertheless, ''[=AoStH=]'' and ''[=SatAM=]'' are [[DenserAndWackier very]] [[DarkerAndEdgier different]] in tone and [[IneffectualSympatheticVillain very]] [[GenericDoomsdayVillain different]] in their characterization of Robotnik, to the extent that the average viewer watching the final products wouldn't dream of assuming that they take place in the same TimeLine.
* YouLookFamiliar: Some of the background badniks' designs were reused in different episodes tweaked or recolored. DOS Holiday from "Magnificent Sonic" uses the same design as Humpty from the pilot and ''Dr. Robotnik's Mean Bean Machine'' for example, while Davy Sprocket from the same appearances reappears as a giant badnik in "The Last Resort".
* YouMightRememberMeFrom: If you grew up in the 1990s with the TGIF block on ABC, you will recognize the voice of Sonic as [[Series/FamilyMatters Steve Urkel]]. Older viewers, particularly the parents of the viewing demographic, will recognize the voice of Dr. Robotnik as the late singer Long John Baldry who was also the voice of [[WesternAnimation/ReBoot Captain Capacitor, the Crimson Binome]].
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