After cutting open Pierce's casts, the group removes all of the items stuck to his legs, but during the Dean's announcement all of the items return.
After they all dress down to their underwear and are standing behind the tables, Annie does not have bra straps. However, later on when she talks to Shirley, she has pink ones.
In Aerodynamics of Gender (2010), Abed calculated Shirley's cycle to begin on 11/4/2010, but in his calendar, he has marked her previous cycle as starting on 10/20/2010 (the year isn't shown, but the dates line up with 2010).
Just after Pierce cleans the tube on his wheelchair and accidentally blows into it at the beginning of the episode, the camera cuts to the shot of the Study Group walking out and the remote controller operator for the chair is clearly seen to the left of the screen.