- All-Star Cast: In addition to the Sonic X voice cast, they also have Lacey Chabert voicing Princess Elise.
- During Shadow's story, you can hear the voice actor for the G.U.N. soldier flub his line and repeat it again... and it's all unedited. Also, another G.U.N. soldier over Rouge's radio refers to the Scepter of Darkness as the "Book of Darkness" at one point, though the subtitles are correct.
- The very first quest in the game is called "The winder of a shoemaker". It's definitely a typo, and was probably supposed to be "wonder".
- Celebrity Voice Actor: Princess Elise was voiced by actress Lacey Chabert, though this is downplayed in that she's still prolific in voice acting.
- Christmas Rushed: By far the most infamous instance of this, although information of its development made it clear it had the deck stacked against it—Sonic Team was forced to develop the game with half of its usual manpower—Yuji Naka had just left Sega and the other half of the team was busy working on Sonic and the Secret Rings, which was made to make up for the fact that Sonic 2006 was impossible to port to the Wii, and they had to make the game for two advanced, brand new consoles. On top of that, Sega wanted the game out in time for Sonic's 15th Anniversary, so Sonic Team was forced to release an earlier, more stable build than what was shown in trailers and disregard bug testing and quality assurance. The final result was a game that left a black mark on the series and Sega's reputation forever, and one of the most infamous video games ever made.
- Creator Killer: A handful of Sega employees, including two of the game's three story writers, were fired from the company after this. In addition, Shun Nakamura, who was one of the leaders of the project and one of those story writers, became less involved with the Sonic franchise as a whole, and the controversy did not do Yojiro Ogawa and Yuji Naka (the latter of whom had departed Sega by this point) any favors for their careers; Takashi Iizuka was eventually put in charge of Sonic Team at the end of the decade to try and fix their mess. Not to mention the failure of that game and NiGHTS: Journey Of Dreams resulted in the death of its developer, Sega Studios USA
- Executive Meddling: This arguably explains why the game was such an Obvious Beta — Sonic Team wasn't given enough time to fix the bugs in the game.George Weidman: The first level is a tire fire. Almost as soon as you walk off the beaten path, the game breaks. Hell, stay on the beaten path, and the game breaks!
- Fan Nickname:
- The game was known as Sonic Nextgen or Sonic 360 amongst fans for quite some time before the official title was announced at E3 2006. Nowadays, it's usually known by Sonic '06.
- There was also Sonic the Disaster, Sonic O'Dicks, Sonic: Birthday Bust, and Sonic: Now Loading
- Some people think it should be called Sonic Adventure 3, considering the multitude of elements it borrows from those games.
- Keep Circulating the Tapes: While used copies aren't too difficult to find, Sega pulled all new copies from store shelves in 2010, so don't expect a rerelease in any form.
- Manual Misprint: Perhaps unsurprisingly, considering the game was released as an Obvious Beta. One example, though — the manual states that the energy meter on the HUD is utilized in conjunction with the special gems that Sonic can buy at the shop in Soleanna, and that it is meant to drain with each usage of the gems. This is not true in the actual game; again, since it was released in an unfinished state, the energy meter never drains and as such Sonic is able to use the gems as much as he wants, when it is quite clear that it was never intended to be this way due to their abilities to break the game on unlimited uses.
- Medal of Dishonor: Meta-example; the game won the "Worst Game of the Decade" award over Big Rigs: Over the Road Racing, and while X-Play had ripped apart a few Sonic games prior and made their disdain for the franchise at the time known previously, this was the first Sonic game to get one of their "Golden Mullets", their version of the Golden Raspberry Award that was taken from Aquaman (the first game on the show to get a 1 out of 5 score).
- Milestone Celebration: It was intended as a celebration of 15 years of Sonic the Hedgehog. One of the rare cases where such a thing went terribly wrong, due to the game being rushed to ensure it was finished in time.
- Name's the Same: Don't confuse this game's Princess Elise with a Nohrian princess also named Elise or an infamous Hell's Kitchen contestant who was also disliked by the masses. Or with Princess Alise, the adopted daughter of Odette and Derek as of their fifth movie.
- Old Shame:
Sonic: Lumpy Space Princess, huh? Last time I met a princess, I We... Y'know, I d— I don't quite remember. Never mind.
- Sega fired the game's writers, apologized on its multiple issues, and later pulled it from stores entirely. All as an effort to forget that the game existed, and to hope that this problem never happens within the series again. However they weren't quite ashamed enough to write it out of Sonic canon forever, as several elements from this game appeared in later installments. Silver appears in a few later games like Sonic Rivals and one of the levels with a boss fight are in Sonic Generations, albeit with a major gameplay overhaul.
- The official Twitter account for Sonic the Hedgehog has made fun of the game more than once.
- During the 25th anniversary event, all the Sonic games up to that point were listed and each game was given a cheerful description. When the list got to Sonic '06 its description was just the game's loading screening.
- Sonic makes reference to the game in LEGO Dimensions, and makes it clear he'd rather forget about it.
- The Other Marty: Veronica Taylor was the original choice to voice Elise before being replaced with Lacey Chabert, but her voice can still be heard in early trailers.
- Promoted Fanboy:
- Relationship Voice Actor:
- Stunt Casting: Elise is voiced by Lacey Chabert, and was voiced by Veronica Taylor in the promo trailer.
- Troubled Production: Oh boy. Although the game, unlike X-treme, was released, the final product was likewise far from finished from the get-go. After Yuji Naka — one of the founding members of the Sonic franchise — resigned from Sega and consequently left ongoing development of the game, massive pressure was then put on the game's director Shun Nakamura and the rest of the development team to have the game (which was supposed to be another great Sonic game that would be used to help re-launch the franchise on next-gen consoles) finished in time for that year's Christmas season as well as be released before year's end to qualify as the 15th anniversary title. And then if that wasn't enough, the development team was split so that a new team could work on a new Sonic game for the Wii console, the result of Sega discovering that a Wii version of the game (which was in development along with the PS3 and 360 versions) was unfeasible due to the Wii's technical limitations. The fact that they had to develop two remaining console versions of the game at the same time during the short development process did not help matters.
- Vaporware: There was originally meant to be a PC version, which was never released. A Wii version was also planned but abandoned.
- What Could Have Been: It was already a mess of a game, but it was only made worse by the fact that it looked promising at one point;
- Early trailers and demonstration videos promised things like a day/night system, multiplayer minigames, and a "free mode" that allowed you to play as any character without storyline constraints. Several functions described in the manual are not actually in the game, including things like the implementation of the Action gauge (it is completely pointless for Sonic and is rather barebones for Shadow and Silver), "maturity" levels for Sonic's custom actions (there are none), and a flight gauge for Omega's hover (he can hover forever, there is no gauge). Most depressingly, code was found for a purchaseable gem that allowed Sonic to relive his glory days of going Super Sonic in-level, rather than just for the final boss. Such a thing was never used until Sonic Colors.
- There were originally plans to create a Wii port of this game, but hardware limitations had them make Sonic and the Secret Rings instead. Ironically, Sega taking half of '06's team to work on Secret Rings was a major contributing factor to '06's unfinished state.
- A more minor standpoint, but it was implied in some unused quotes in the game that Sonic/Shadow gets sucked into the tornado in Crisis City and the other one has to rescue them, the two nearly thanking each other. In other words, it was implied they were going to be playable in each other's action stages.
- While working on a demo for the game, the team working on the 360 version took some time to fix some bugs, as well as vastly improving the camera and controls. But Sega insisted that the PS3 version of the game be the definitive version and forced the 360 version to be a straight port of it, bugs and all. People who have played the 360 demo lament that this wasn't the official version of the game, as it shows a glimmer of how great it could have been, and modders have even been trying to recreate the feel of the demo for the rest of the levels.
- Word of God: Silver and Eggman Nega are from the future, while Blaze is from an alternate dimension. The explanation for her presence in the future is that apparently the two of them got amnesia as "do everyone else". Though this only raises further questions.
Trivia / Sonic the Hedgehog (2006)