Revealing mistake: When three of the turtles are playing Trivial Pursuit and Leonardo runs in to announce Splinter is alive, you can see a wire coming out of Raphael's shell. I guess it's for the animatronic head, but it's visible. (00:59:30)

Teenage Mutant Ninja Turtles (1990)
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Directed by: Steve Barron
Starring: Sam Rockwell, Elias Koteas, Judith Hoag, Josh Pais, Michelan Sisti, David Forman
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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?
Trivia: At one point in the movie Shredder scolds Tatsu, and right after that, Tatsu curses saying, "kuso." That's about the equivalent of saying sh*t in Japanese.
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Answer: It's not really petty thievery. Shredder essentially has control over a large crime syndicate which is involved in pickpocketing, burglary, and highjacking. And that's just the gang itself. The Foot Clan itself is probably involved with other activities that we haven't seen.