Continuity: Phoebe's birthday is inconsistent. In "The One with Frank Jr." Phoebe tells her half-brother that her birthday is February 16th. Also, in "The One with Two Parts (2)" Phoebe has a birthday party in February. However, in this episode, Rachel talks about Phoebe's last birthday party. Since Rachel first met Phoebe earlier that season, this implies that Phoebe's birthday must have occurred since September, when Rachel first joined the group. Also, in "The One with Phoebe's Birthday Dinner", Phoebe's birthday is close to Halloween, consistent with Rachel's statement. Furthermore, in "The One Where They All Turn Thirty", the flashbacks of Phoebe's 30th (really 31st) birthday imply her birthday is in the summer.