The One With The Soap Opera Party - S9-E20
Continuity mistake: When Rachel is confronting Joey about the secret party the water bottle in her hand changes from her left to her right hand back to her left again. (00:06:10)
The One With The Soap Opera Party - S9-E20
Continuity mistake: When Ross is telling Rachel and Phoebe about Charlie's past boyfriends, he refills two wine glasses. Then in the next shot, he puts his hands to his cheeks in shock because he just remembered something, without putting the wine bottle on the table. It just disappears from his hands. (00:16:05)
Answer: Usually by the seventh night of Hanukkah you don't know what to get the other person, and you will probably resort to getting the other person something insignificant. Chandler is basically saying that the pen is a stupid gift.