When Ross goes to talk to the "Ugly Naked Guy" into giving him the apartment in the previous episode, the apartment number is 201. In this episode after Ross gets the apartment, the apartment number is 3B.
After being thrown out of the party for Howard, and Ross and Phoebe are back at Ross's apartment, Phoebe is clearly holding a bag of "CHEEZ-IT Party Mix". The first letter (C) and the last letter (T) have been redacted from the bag, resulting in "HEEZ-I". The spaces for the missing letters are still visible.