Four stars of the real version of the NBC daytime soap opera Days of Our Lives (1965) had cameos, attending Joey's rooftop 'Soap Opera' party as themselves; Kyle Lowder who played Brady Black from 2000 to 2005 and Matthew Ashford who played Jack Deveraux from 1987 to 2012. Also, in the background, are Farrah Fath who played Mimi Lockhart, and Alexis Thorpe who played Cassie Brady.
The cafe that Ross is having lunch with the other two professors, is the same cafe set from the Friends "Days of Our Lives". It was shown in the previous episode S9 E11 "The One Where Rachel Goes Back to Work". In the scene Phoebe is an extra.
The magna doodle has a drawing of Hello Kitty.
When Joey is going through Rachel's list of men's phone numbers, he says "This guy is in a cult, okay. It will cost you $5000 to get to level 3 and I don't feel any different". This could be an allusion to the Church of Scientology, which many people believe to be a cult. Members are also expected to pay large sums of money to ascend through the many levels of Scientology. Various celebrities, such as Tom Cruise and John Travolta, are Scientology members.