Continuity mistake: When Will phones Jack, while he hides in the bathroom, Jack puts a plate of chicken down and answers the telephone. Then through the following conversation they have the position of the fried chicken pieces on the plate differ. (00:53:50)
Continuity mistake: When Will stops Grace, as they are about to have sex, they sit up in the bed, and he tells her he thinks they should wait. In the first shot Grace's black strap is falling off of her arm, yet in the next shot it's back up on her shoulder. (00:59:20)
Plot hole: In this episode during the flashback scenes, it is shown to us that Will comes out of the closet during his freshmen year of college during Thanksgiving Break, when they spend the weekend at Grace's Parents house. However in the season 1 episode "William, Tell" Grace claims that Will came out to her at senior year of college during Christmas Break. Quite a difference for such a memorable time.
Continuity mistake: When Karen arrives late to Mason's swim meet, Jack balls her out, and she stirs the Bloody Mary she's holding then throws the celery stalk down into the pool. Yet, two shots later, as Jack rides his scooter out, the long celery stalk is amazingly back in her drink. (00:50:40)