The dress Jenny wore to the Ivy League party is the same dress Blair gave her in The Wild Brunch (2007).
When the usher assignments for the 'Ivy League Mixer' are posted to the bulletin board, the episode's unit production manager, Bart Wenrich, is listed as the usher for the Penn representative.
Each episode's title (except the pilot) is based on the name of a film or book. This episode is a direct copy of the movie title "Poison Ivy'.