Trivia: This film features appearances from WWE alumni John Cena and Dwayne Johnson. There used to be real-life acrimony between the two, as Cena was critical of Johnson for leaving the WWE to pursue a film career, alleging he abandoned his fans and the business he claimed to love. Cena would later apologize for this disposition after pursuing a film career of his own, acknowledging that he didn't make the effort to view things from Johnson's perspective.
Trivia: The final film starring Bruce Willis to be released, coming out almost exactly one year after he announced his retirement due to Frontotemporal Dementia (initially diagnosed as Aphasia). Like many of his final films, it was created primarily for the VOD, streaming and home-video market, but was also given a token limited release in certain overseas markets.
Trivia: This is the second consecutive Ninja Turtles film in which Rocksteady is portrayed by a professional wrestler. He was played by Sheamus in Teenage Mutant Ninja Turtles: Out of the Shadows, and voiced in this film by John Cena.