Dr. Eggman: "No robots were harmed in the creation of Sonic Colors. They were all unfortunately harmed after the game was released."
- Casting Gag: The announcer in the Japanese version of Colors is Fumihiko Tachiki, who is the narrator for Kamen Rider W as well as the voice actor for the Gaia Memories, where he announces each power just like he announces the Wisp Powers in Colors.
- Content Leak: Sonic Colors: Ultimate ended up getting leaked on both the website for German localization team iksample and French retailer SoGamely a month prior to its reveal.
- Dummied Out:
- There's a bunch of unused voice lines in the files for the Wii version. Most are one-sided Boss Banter from Sonic, meant to be heard during gameplay; there's also a few lines from Eggman for the final boss. Tails, meanwhile, has a lot of unused lines related to a cut Hint System. The unused lines were eventually restored for Ultimate.
- Text leftover in Ultimate expands on what the "Ghost Racer" mode would have been like, and also implies that there was going to be a Metal Sonic skin for Sonic, possibly after completing all Rival Rush levels.
- First Appearance: Of Cubot and the Wisps.
- Follow the Leader: It’s clear Sonic Colors: Ultimate is one of Sega's ways of cashing in on the HD remaster/remake trend that got especially popular during The Eighth Generation of Console Video Games.
- Limited Special Collector's Ultimate Edition: Sonic Colors: Ultimate got a pretty cool one known as the "30th Anniversary Package". This set included a copy of the game, a "Life in Sonic's World" art book and audio CD, and a collector's coin. However, this version was only released in Japan and Korea.
- Milestone Celebration: Sonic Colors: Ultimate is one of several games made for the franchise’s 30th anniversary.
- No Port For You: Was originally the case for the Wii version until the announcement of Sonic Colors: Ultimate. This is still the case for the DS version, unfortunately.
- The Original Darrin: After being replaced by Colleen O'Shaughnessey from Sonic Boom onwards, Kate Higgins came back to record new lines for Ultimate and Rise of the Wisps.
- The Other Darrin: Beginning with Colors and Sonic Free Riders, the English dubs of the games have been recorded in Los Angeles and all of the VAs were replaced, save for Mike Pollock as Dr. Eggman.
- Pre-Order Bonus:
- Pre-ordering this game from GameStop would allow one to receive a hat shaped like Sonic's quills.
- Pre-orders in the UK came with action figures of Sonic and some wisps, with different wisps being exclusive to the version pre-ordered. Not everyone got the figures, though, since they ran out of supply.
- The Ultimate remaster came with a few different bonuses depending on what version you bought. The physical Launch Edition came with a keychain of Baby Sonic from Sonic the Hedgehog (2020). Those who pre-ordered the digital version received exclusive player icons, a boost aura based on the aforementioned feature film, and those who opted for the Digital Deluxe Edition were allowed to install and play the game four days before its official launch date.
- Refitted for Sequel: Aquarium Park is based on an old concept for a Japan-themed underwater zone that originates from preproduction sketches of the original Sonic the Hedgehog game.
- Role Reprise:
- Mike Pollock, one of the cast members from the New York City-based dub of the games starting with Shadow the Hedgehog as well as the Sonic X anime, returned to reprise his role as Dr. Eggman, despite everyone else being replaced.
- For the Sonic Colors: Ultimate remaster and the Rise of the Wisps cartoon, Kate Higgins returned to record new voice lines for Tails, after having since been replaced in the role by Colleen O'Shaughnessey from Sonic Boom onwards.
- What Could Have Been:
- Ryan Drummond auditioned for the game when Jason Griffith was fired. The reason as to why they casted Roger Craig Smith for Sonic instead is because Sega said that Drummond would have to leave his union and he would be paid very little.
- Mike Pollock revealed that Sega did consider replacing him too, but that none of the other actors that auditioned could match his performance as Dr. Eggman, so he ended up being the only member of the 4Kids Entertainment-era cast to stay.
- Based on concept art of the Egg Pawns, there would've been white enemy Egg Pawns designed specifically for Terminal Velocity, but appear to be scrapped. They do, however, appear on that level's world map.
- The Wisps went through several different designs before getting their current designs
◊, all of which look wildly different from their final designs. - Leftover voice clips in the game's files imply that there was originally a lot more banter from Sonic towards the bosses and between him and Eggman in the final boss. However, most of this was cut out, with Sonic remaining mostly silent in them. These voice clips would later be restored in Ultimate.
- Unused voice clips also suggest that the Tails Hint System from Ultimate was originally intended to be in the Wii version.
- If internal files are any indication, the Wii version was originally meant to follow the traditional Sonic structure of having two main acts and a boss, with the other acts being optional side missions. However, likely to pad out the game's length, this approach was scrapped and the two acts were split into multiple acts and the optional side missions became main acts instead, resulting in the six acts per zone seen in the final game. The DS version still follows this structure.
- In Ultimate, the icon for the Final Color Blaster shows eight wisps (including the new Jade Wisp), even though the FCB still only uses the original seven in the final version, suggesting there was going to be an updated version of the attack at some point.
- Ultimate's Xbox store listing mentions a "Ghost Racer" mode that isn't present in the final game.
- Word of God: According to Ian Flynn, unlike the later handheld versions, both the Wii/Ultimate and DS versions of Colors are canon. note
