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: When Greer and Castleroy are having dinner together he asks Leith to pour wine for them, but what comes from the jar is water. (00:15:45)