Actually, that the bad guy, even in feudal Japan, is a greedy European man, is pretty damn smart for a TMNT film, compare it to TMNT(2007), where a colonially-minded, wealthy, culturally appropriating white man is the red herring villain obfuscating the "dangerous foreigner" mastermind. Teenage Mutant Ninja Turtles III is full of nice little touches and clever ideas, like the turtles, now 17 years old (they were identified as aged 14 in the 1990 film) wanting to stay in the past because they don't have to hide from people and are appreciated for who they are. Those familiar with psychological development theories will see something in that small part alone. The puppetry has improved again since the previous film, and this time around, the action scenes got better, possibly because the suits are easier to move in? I've done enough horse riding to know that it's actually pretty tricky, I'd hate to try it in a foam-rubber turtle suit and plastic samurai armour.
Casey Jones is back, but relegated to a b-story about teaching hockey to the time-displaced Samurai Honour Guard; still better than the version in Out of the Shadows. Even, for the moment, not taking the decline of the turtles culturally in the mid-1990s, it's easy to see how there wasn't a fourth film in this franchise. Teenage Mutant Ninja Turtles III was, despite some truly clever moments, just not good enough to cycle into another film. Again, I don't own a physical copy of this film, and I don't intend to get one, but I'm glad I got to see it again as an adult and not have to rely on misty memory. Seriously, I remembered this film having child vampires in it? I'd say I'm confusing it with The Next Mutation, but I don't recall having ever watched The Next Mutation. Due to my non-existent memories of childhood, nostalgia doesn't really function for me, but I felt a twinge of something with this film.