Plot hole: None of the Arkham inmates other than Poison Ivy should've mutated. The stuff only mutates you into a half human half animal creature, etc., if you've recently touched an animal or plant like Ivy did.

Batman vs. Teenage Mutant Ninja Turtles (2019)
2 plot holes
Directed by: Jake Castorena
Starring: Eric Bauza, Troy Baker, Darren Criss, Kyle Mooney
Genres: Action, Adventure, Animated, Comedy, Crime, Fantasy, Sci-fi
More mistakes in Batman vs. Teenage Mutant Ninja Turtles
Batgirl: And then they were gone. It all happened so fast. And I didn't have time to, you know, Batgirl up. Those things, they were like lizard men or something. They took the generator. Into the wrong hands, it could blow up a city block. We have to stop them, Batman.
Batman: Whatever they are, they're going to regret stepping foot in Gotham.
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