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 Toon Disney'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 when they aired it prior to the attacks, so they knew that the episode had questionable material. The Toon Disney version of episode was circulating on YouTube for a couple of years before the uncut episode was finally given a proper release on DVD, thanks to Shout! Factory.
"Magnificent Sonic" was banned for a short while after the Columbine shooting due to all the guns featured in the episode.
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 scenes and scenes that draw too much attention on Robotnik's rear end. This also includes the bikini pic from "Hero of the Year."
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.
The abstract, Jackson Pollack-esque backgrounds? The thin, nonsensical plots? The loose, Off-Model animation? Yeah, a lot of this show was, shall we say, inspired by The Ren & Stimpy Show. Justified in that a number of ex-Ren & Stimpy crew members actually worked on the show.
Tiny Toon Adventures and Animaniacs may have had some influence on this show, considering that the animation company TMS actually did work on all of those shows as well as Adventures of Sonic the Hedgehog.
Nearly every sound effect in every episode from the series derives from those used in Hanna-Barbera cartoons. Seriously, just try to find a sound effect in the series that isn't in a Hanna-Barbera cartoon.
The episode "Grounder the Genius" features two of the actual sound effects from the Sonic gamesnote Thefirstthree in one part of one scene; specifically, the "jump" and "ring" sound effects.
Name's the Same: Christopher Stephen Welch shouldn't be confused with Christopher Evan Welch.Explanation For a long time, Christopher Evan Welch was credited for providing Tails' voice. When he died in 2013, many fans noticed that there was a discrepancy between his age and Tails' voice, as he was 27 when Adventures of Sonic the Hedgehog first aired in 1993. It wasn't until 2014 when it was revealed that Christopher Stephen Welch was the one who actually provided Tails' voice.
In the unaired pilot, Dr. Robotnik and Scratch was voiced by Jim Cummings, 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, Kath Soucie, was under contractual obligations to voice Lola Bunny in Space Jam at the time, so her lines were written out and Tabitha St. Germain provided her vocal effects in the special.
Out of Order: The last episode to be numbered on Wikipedia is "Sonically Ever After", while the last episode aired, and placed in the production code, is "Hero of the Year".
The cartoon was going to last longer, but it played the 65-Episode Cartoon trope straight.
There was a workprint of a pilot episode that was screened when the cartoon was being pitched to ABC. The network rejected it and instead preferred DiC's 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 (as mentioned above in The Other Darrin), a narrator (voiced by Gary Owens) speaks 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' writers' bible, in an attempt to establish a connection with the 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". insinuating that this is the same Sonic, Tails and Robotnik inhabiting the same world rather than 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 verydifferent in tone and very 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 Alternate Timeline.
You Look Familiar: 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".