Audio problem: In the scene in the pharmacy, when Pacey says "20 milligrams", his mouth doesn't move. (00:13:05)
Plot hole: During this episode, Jack is at Joey's house at night for some time. Pacey and Andie obviously spend a great deal of time together that same night with dinner, a walk and the Bed & Breakfast session (and we later find out they stayed there much longer than it looked originally). It has been mentioned in the past that Jack and Andie have to 'take turns' watching their mother, and they can't leave her alone at night. Therefore - while Jack is posing for Joey for much of the evening and night, and Andie is out on a date for much of the evening and night; who is watching their mother?
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.