Other mistake: If you look closely at the army of Rangers in the opening credits, you can see four versions of Tommy Oliver: Green Ranger, White Ranger, Zeo Ranger Red, Black Dino Ranger. Even though he had a single clone made, he can't be four variations at the same time.
Other mistake: In the credits for "Tests," the "created by" credits for the characters of Anarchy and Katana are swapped: Mike W. Barr and Jim Aparo are erroneously credited for creating Anarchy (when in fact they created Katana as part of the comic "Batman and the Outsiders" in 1983), while Alan Grant and Norm Breyfogle are incorrectly credited for creating Katana. (Grant and Breyfogle created Anarchy in issues of "Detective Comics" from 1989.)