Revealing mistake: When the Rangers kick Oozemen's ass, the pink Ranger starts off with the "You guys make me sick sick sick -kick". While all Rangers are fighting, the blue one is just standing still next to the camera. You can see his shoe in the in the lower right corner waiting for his entrance.
Revealing mistake: In the scene where the morphed Red and Black ranger fight the ooze-men, the red ranger does a "tornado-kick" right before Adam says "rocky behind you.". In the middle of the tornado-kick there was an obvious edit of the shot. The oozeman suddenly is a few steps back and the camera seems to have repositioned. This bad cut was more noticable in the vhs-release.
Revealing mistake: When the Rangers de-morph we see them looking at their hands and bodies. However, when the actual suit disappears, their hands, arm and even heads are in different places. This is really noticeable with Billy. His suited hand and unsuited hand, while the same hand, are about a foot apart.