When Shirley's Island is falling apart, Magnitude can be heard saying "I'm actually British!", referencing the fact that Luke Youngblood, the actor who plays him, is from the UK (his most well known roles being the Harry Potter film franchise, where he plays Lee Jordan and The Story of Tracy Beaker (2002), where he plays Ben).
This episode for the first time conclusively establishes where the show is set when Jeff mentions that he has never set foot outside of Colorado.
The outfit that Chang is wearing as one of the "locker boys" is reminiscent of the character Rufio from the movie Hook (1991), particularly the red hairpieces. The Locker boys themselves are also likely meant to be a reference to the Lost Boys.
WILHELM SCREAM: Heard when Abed's and Troy's orb runs over an opponent.
The scene outside the library shows a garbage bin lying on the ground. In Geography of Global Conflict (2011) it was mentioned that students tend to bump into the left garbage bin coming out of the Library.