I know that a lot of Simpsons fans really don't like The Principal and the Pauper, and honestly, its biggest problem isn't that the episode isn't funny. It honestly is a funny episode.

Its problem has to do with them throwing away all of the time they invested on building Skinner's character and just throwing it away for an episode... and then that not even mattering, anyways, because Skinner is granted his identity back rather than what his identity was. That's what irritates me about the episode: they made an entire kaboosh about Skinner being a fake and then they throw it away only for it to be referenced sparingly as a gag in future episodes.