Trivia: This episode features a pay-off for a joke that was established in the first two seasons. In season one, the character Professor Slater mentions the name "Beetlejuice" while trying to recall Britta's name. In season two, Britta refers to Jeff's underwear as "stripey Beetlejuice numbers" during a conversation. And in this episode, Annie says that Britta has the "Beetlejuice" soundtrack on her computer. As Annie says the name, the character Beetlejuice is visible briefly walking by a window in the background, his name having been said three times. (In the film "Beetlejuice", he is summoned once his name is spoken three times).
Trivia: Not really a mistake, but something amusing to watch for. During the big opening musical number, watch Britta's face closely when Chang runs in. Right as he runs by her, her eyes squint in pain for a very brief instant and she reflexively mouths the word "Ow!" It's hard to see what's going on because it goes by quick, but it looks like the actor portraying Chang either accidentally kicked her in the shin or stepped on her foot as he ran in, and she reacted.
Trivia: This episode aired Sept 22, 2011 where Abed learns season 3 of the (real life) TV show "Cougar Town" is moving to mid-season, which he fears means an upcoming cancellation. Abed and Troy say "6 seasons and a movie" in regards to the show (a line previously used in reference to "The Cape", another favourite show of his). While no movie was made, "Cougar Town" did move to mid-season in 2012 and lasted for 6 seasons.