Other mistake: In the music within the ending credits, the lyrics incorrectly state that Raph is the leader of the group when all Turtle fans past and present know it is Leo.
Teenage Mutant Ninja Turtles (1990)
Ending / spoiler
Directed by: Steve Barron
Starring: Sam Rockwell, Elias Koteas, Judith Hoag, Josh Pais, Michelan Sisti, David Forman
Splinter kills Shredder by causing him to fall to his death. After he falls into a garbage truck, Casey Jones turns on the machine that crushes the trash which Shredder is in. The turtles reunite with Splinter, Danny reunites with his father, and Casey kisses April.
Lifesava
Casey Jones: This is great. First it was The Farm That Time Forgot and now this. Why don't I ever fall in with people who own condos? Probably hard to get good maid service in a sewer. Maybe you guys should try Roto Rooter, huh?
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Answer: Most likely to kill Shredder and make sure that there would be no way to come back but, as seen in the sequel, Shredder does return.