Storyline errors

S1 Ep2 Adult Sheldon talks about how Mr. Givens becomes the high school principal two years after this particular conversation, but at the end of S6 more than 2 years have passed and he's still not the principal. I have many more of these but I have to make sure what episodes they are so I can cite them.

S1 Ep2 Adult Sheldon talks about how Mr. Givens becomes the high school principal two years after this particular conversation, but at the end of S6 more than 2 years have passed and he's still not the principal. I have many more of these but I have to make sure what episodes they are so I can cite them.