Near the beginning of the episode, Blair makes a comment to Serena, mentioning Taylor Swift. In real life, Taylor and Blake Lively (Serena van der Woodsen) are very close friends and Taylor even used the names of Blair's daughters, James, Betty and Inez in her song, 'Betty'.
At the end of the episode Serena is shown wearing the same pair of boots that Jenny is seen wearing in season 4 episode 10, Gaslit (2010).