Wallace Shawn who plays Blair Waldorf's stepfather, Cyrus Rose, says "Hey! She's here! The princess bride!" when Blair steps off the elevator into her penthouse. Wallace Shawn previously played Vizzini in the cult classic, The Princess Bride (1987).
A week before the episode aired, The CW ("Gossip Girl") published the following message: "Looks like our little Upper East Siders have all grown up. Gone are the days of lunches on the steps of the Met and the war between S & B. Times have changed. S & B are BFFs and there's a real life prince charming in the picture now. Happy 100th episode, minions! XOXO, Gossip Girl."