In the last scene Troy and Abed are at Greendale. But they were expelled from Greendale at this point in the story, so they weren't allowed at Greendale.
During the title sequence, all of the digitized likenesses show the characters wearing headsets; however, in the previous scene both Troy and Jeff were not wearing headsets when the pictures were taken.
When Gilbert gives himself the special powers, in the list of special powers, "Respiratory" is misspelled as "Resperitory;" and "Opponents" is misspelled as "Oponents."
When Abed is first talking with Hilda via the dialogue box, Throne is misspelled "Thrown"
Around 18:40, Gilbert Lawson's (Giancarlo Esposito) voice is dubbed over saying that his father sat on him in church. His mouth does not match the dub.