Rufus and Flynn introduce themselves as Pinkerton detectives John McClane and Hans Gruber, characters from Die Hard (1988).
When Lucy introduces herself and Wyatt to Grace, she gives their names as Ally McBeal and Johnnie Cochran. Ally McBeal (1997) is a fictional lawyer and Cochran famously defended O. J. Simpson.
There were 2 newspapers mentioned when the team enters the hotel: the (New York) Post and the (New York) Times. The Times has a more prestigious and affluent following, while the Post, founded by Alexander Hamilton, has a more populist sentiment.
Throughout the episode and especially at the end, Nicholas and Emma talk about a Rittenhouse agent named Andre whom they refer to as "him", and Emma claims that Flynn killed him. However, Andre is never seen, and the only Rittenhouse agent killed on screen is a woman. Andre exists entirely off-screen.