The Lebanese Tony Shalhoub is the fourth actor of Asian origin to portray Splinter, after the Japanese Mako and the Chinese actors Feodor Chin and Hoon Lee.
The Turtles are visually based on their Teenage Mutant Ninja Turtles (2014) designs:
Raphael is the most muscular and scarred, having a cracked shell and a du-rag bandana.
Donatello is distinctly leaner than his brothers and incorporates tech gear into his body
Michelangelo is the shorter of the Turtles.
"Novantanove Formaggio" is (almost) Italian for "Ninety-Nine Cheese".In fact the word "Formaggio" is singular while the plural is "Formaggi", so the correct name for the pizza would be "Novantanove Formaggi".
April's boss in the film, Bernadette Thompson, is a feminine version of Burne Thompson, April's boss in Teenage Mutant Ninja Turtles (1987).
TMNT co-creator Peter Laird was not directly involved with the movie, so he suggested some caution about overreacting to the film's origins. He stated that the rumored extraterrestrial origins "might actually work. I'm not saying it's probable, or even somewhat likely... but it IS possible."
Megan Fox broke her little finger during filming.
Tohoru Masamune is the first ever Japanese actor to voice the Shredder.
In the original TMNT comics by Kevin Eastman and Peter Laird, Splinter found a book on Renaissance artists that he uses to name the Turtles; in the film he finds a book on martial arts that inspires him to school the Turtles in martial arts. The book has Eastman and Laird's names on it, homaging their role as creators of the Turtles.
A billboard advertising "Project Almanac" can be seen. Project Almanac (2014) is a film about a bunch of teenagers on an adventure, directed by Dean Israelite (the cousin of Jonathan Liebesman) and produced by Michael Bay.
The previously planned title, 'Ninja Turtles' was subsequently changed to 'Teenage Mutant Ninja Turtles' following fan protest. However, the Italian release title is 'Tartarughe Ninja' which translates to Ninja Turtles. While the official title in Japan is 'Mutant Turtles', which dropped the word ninja completely.
After the foot clan captures the three turtles, for a quick second you can see a billboard advertising Project Almanac directed by Michael Bay
Megan fox broke her little finger while filming
"Novantanove Formaggio" is Italian for "Ninety-Nine Cheese".
The first scene in the film is a zoom into the New York sewers. This is a homage to the title sequences of Teenage Mutant Ninja Turtles (1987) and Teenage Mutant Ninja Turtles (2012), which had this as their opening shot.
The highest grossing film in the Teenage Mutant Ninja Turtle film franchise.
In the original Kevin Eastman-Peter Laird comics, Splinter found a book on Renaissance artists that he uses to give the Turtles names; in the film he finds a book on martial arts that inspires him to school the Turtles in martial arts. The book has Eastman and Laird's names on it, homaging their role as creators of the Turtles.
Megan Fox, Will Arnett and Johnny Knoxville cited their children as a big factor in their decision to be in the film.
Co-creator Peter Laird was dismissive of early reports that the turtles would be aliens. On his personal blog he suggested this was related to efforts add more turtles, which he called a "weak, facile, creatively bankrupt idea." He added "for the first time - someone has come up with a way to have as many freakin' Turtles as they want." Because Laird was not directly involved with the movie he did suggest some caution about overreaction to the reports stating that the extraterrestrial origins "might actually work. I'm not saying it's probable, or even somewhat likely... but it IS possible."
The sandwich that Vernon Fenwick (Will Arnett) makes in his apartment is a mustard and Parmesan sandwich, the same sandwich that Arnett's character Gob Bluth makes in Arrested Development (2003). He is also listening to George Michael music - that name is commonly used in the Bluth family.
Eric Sacks mentioned testing the mutagen on rabbits. This is a homage to "Usagi Yojimbo", a comic about a samurai bunny. Yojimbo and the Turtles have teamed up on several occasions.
The vigilante Casey Jones was originally to be April's sidekick, but he was replaced with April's co-worker Vernon Fenwick since he felt more reasonable as her human partner. Jones will instead appear in the sequel.
Whoopi Goldberg stated that this movie has been a lifelong goal of hers: "My daughter was a huge fan of the original TMNT cartoon so when the original movie was announced she wanted me to be in it and so I asked around but it never happened, same with the other films they made, so when I heard this new project get announced I asked around again and to my surprise I got the part!"
On the Japanese mural in Eric Sacks' office, an Utrom can be seen waving a sword. This pays homage to Teenage Mutant Ninja Turtles (2003), where the Utrom Krang had arrived in feudal Japan.
Within two weeks of the films release in the u.s a green light was given for a Michael Bay sequel.