Paul Lieberstein (Toby) very briefly broke character. In the scene in which Steve Carrell (Michael) is stuck in the men's room and Toby is talking to him, the exasperation sounds made by Michael was enough for Lieberstein to laugh to the point he walked out of shot.
This episode is B.J Novak's (who plays Ryan, and is a writer and producer for the show) favorite episode of The Office.
Dwight's middle name is Kurt.
Rainn Wilson, (Dwight Shrute) said in The Office Retrospective, that this is his favorite episode of the show.
Michael asks Ryan if he checked the store in Stroudsburg to see if they had yams. Stroudsburg is 40-45 minutes from Scranton.