Goodbye, Yellow Brick Road - S6-E21
Plot hole: In the beginning of the episode, Joey and Audrey are talking in their dorm room. Audrey makes a comment that "Our time in this particular room is over". They have been in the same dorm room (27) for two years now, their Freshman and Sophomore years at Worthington. They still have 2 more years to go. What would make Audrey think that they would suddenly have to change dorm rooms when they've had the same room the entire time? Or that they wouldn't still be roommates the next academic year at Worthington? Audrey is staying to take Summer School classes so she doesn't have to leave the University. (00:08:40)
Goodbye, Yellow Brick Road - S6-E21
Revealing mistake: Watch Busy Phillips' hand in the bar scene where Audrey sings - she's very obviously not playing that guitar.
Answer: It's the same apartment Joey had in NYC. Comparing it to the beginning of the Finale; you can tell it's exactly the same location, furnishings, Plasma TV etc. Apparently Chris was only living with her at HER apartment, and now Pacey has taken his place at the end. I guess this implies Pacey successfully started his own restaurant business in NYC as he had dreamed, to be with Joey.