Mistakes
When three of the turtles are playing trivial pursuit and the fourth 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 clearly visible. See more...
Trivia
At one point in the movie Shredder scolds his bald henchman, and right after that, the bald guy curses saying, "kuso." That's about the equivalent of saying sh*t in Japanese. See more...
Movie Mistakes blog
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Other great sites
Teenage Mutant Ninja Turtles (1990) - 5 with pictures
Directed by Steve Barron, starring Elias Koteas, Sam Rockwell (add more)
Genres: Action, Comedy, Crime, Drama, Family, Sci-fi
Screenshots of mistakes that have been online for less than a year are only visible to members, but the rest are available to everyone. Don't forget to check out the picture of the day, updated daily, and the top 30 screenshots too.