Keep Circulating the Tapes: The game has been delisted from every digital distribution store it's ever been on. The fact that the game was never given a physical release only makes this worse, since it basically confines the game to those who had purchased it back when it was available and those who can find a used console with the game in it (the latter method being a crapshoot at best).
It was very briefly re-listed on Steam. It was delisted just as quickly, with anyone who bought the game during this brief period being refunded, which suggests this was an error.
The movie:
Box Office Bomb: Budget, $135 million (not counting marketing costs). Box office, $82,051,601 (domestic), $245,623,848 (worldwide). Things could have gone very badly if the movie didn't do so well overseas and in DVD sales. The consequences? Viacom's quarterly profit reports went down and the planned third film was scrapped, an announcement made while the film was still in theaters, no less.
Celebrity Voice Actor: In the Latin American Spanish dub, Rocksteady and Bebop are voiced by YouTube's bloggers Gabriel "Werevertumorro" Montiel and Alejandro "Alex" Montiel respectively, and Krang is voiced by comedian Facundo Gomez.
Contractual Obligation Project: Alan Ritchson says that he only returned because he was locked into a three-picture deal and that he'd done everything he could to try and get out of his contract after the miserable experience he had with the previous film.
Kevin Eastman: ...When I sold my part and Pete sold his part of the Turtles, there were versions of it done later that I didn't like as much. I didn't not like them but there were things like the Turtles Forever animated movie, which I liked very much, which I had no input on. The 2007 animated movie I worked a little bit on, but that was really Kevin Munroe who wrote and directed it, fantastic. Um, the Michael Bay versions of the movies, I like a little less. (Audience laughs) And I had input on those, unfortunately. Um, I think they used anything I consulted and I told them when they were working on those live action movies, I think they used it as a... to do the opposite of it. [...] "Yeah, don't make them 8 foot 2 tall, bulletproof and give them noses." "Okay!"
Creator Cameo: Franchise co-creator Kevin Eastman appears as a pizza delivery guy.
Creator Killer: The second Paramount/Nickelodeon TMNT film was one of several 2016 bombs that mixed together with a shareholder revolt at Viacom from Sumner and Shari Redstone over CEO Philippe Dauman's handling of the company, leading to Dauman's resignation from Viacom after 10 years. It was also one of the last straws for Paramount CEO Brad Grey, who resigned in February 2017 and died a few months later.
Disowned Adaptation: As with the previous movie, Peter Laird does not include this sequel in the Q&A blog post.
Franchise Killer: According to this interview, the movie didn't earn enough money to justify a second sequel that was being planned. The makers were confident this wouldn't be the last Ninja Turtles film (a sentiment that has since then been proven to be true, as both a feature-length special based on Rise of the Teenage Mutant Ninja Turtles and another theatrical film produced by Seth Rogen have been released in the years since, but it's safe to say we won't be hearing from this iteration of the boys in green again anytime soon, if ever.
Money, Dear Boy: The four turtle actors had a miserable time with the first movie, so Paramount tried to stem a rebellion by tempting them with the promise of some profit sharing, which the studio ultimately reneged on.
The Original Darrin: Pete Ploszek gets to provide motion capture and voicework for Leonardo this time rather than having dubbed over by Johnny Knoxville as in the previous film. This wasn't clear until the film actually came out, and Knoxville says he doesn't know why he wasn't asked to return.
In the Japanese dub, Kanako Tojo voices April O'Neil instead of Becky.
The Other Marty: Fred Armisen was originally scheduled to play Krang, and was all set to shoot his scenes, but he bowed out due to scheduling conflicts. He was subsequently replaced by Brad Garrett.
Refitted for Sequel: Krang, as well as Bebop and Rocksteady were all considered for the first movie to the point of making it to the concept art phase, but didn't get in. They're finally making their big-screen debut in this one.
Role Reprise: Mário Jorge, Garcia Júnior and Márcio Simões reprise their characters from the original series (Krang, Bebop and Rocksteady) in the Brazilian Portuguese dub. It helps that the movie's ADR director/translator, Manolo Rey, was the original voice of Leonardo.
What Could Have Been: CM Punk was considered, and auditioned for the role of Rocksteady. The role eventually moved to fellow WWE superstar Sheamus.
Working Title: Before the trailer hit, the film's title was previously reported to be Teenage Mutant Ninja Turtles: Half-Shell.
compared to more Truer to the Text adaptations.Kevin Eastman: ...When I sold my part and Pete sold his part of the Turtles, there were versions of it done later that I didn't like as much. I didn't not like them but there were things like the Turtles Forever animated movie, which I liked very much, which I had no input on. The 2007 animated movie I worked a little bit on, but that was really Kevin Munroe who wrote and directed it, fantastic. Um, the Michael Bay versions of the movies, I like a little less. (Audience laughs) And I had input on those, unfortunately. Um, I think they used anything I consulted and I told them when they were working on those live action movies, I think they used it as a... to do the opposite of it. [...] "Yeah, don't make them 8 foot 2 tall, bulletproof and give them noses." "Okay!"