The Halloween episode went above and beyond with the meta references to the original series. As two popular girls from a rival school, Pippa and Bianca, dress up as Blair Waldorf and Serena van der Woodsen, Julien and Zoya decide to ditch their clothes and put on Aki and Obie's suits to transform themselves into Dan Humphrey and Chuck Bass. At one point, Zoya replicates Chuck's iconic line from the original by telling reporters, "I'm Chuck Bass."
In this episode, there is a brief but incredible cameo from Nelly Yuki, who served as one of Blair's minions in earlier seasons and eventually became an editor for Women's Wear Daily. It appears like she has gotten another promotion, as she's now an editor for New York Magazine.