Continuity mistake: When Will tells Grace that he is gay, there is a tray of finger foods on the table next to him, as he kneels on the floor. In the second shot, the plate is covered in cling film, but in shots before and after, there was no cling film.
Continuity mistake: When the four are eating dinner and talking, Will says "Well I don't wanna sleep with you either," and in this closeup Karen picks up her glass of wine. In the next shot the wine glass is back on the table and she's now holding her fork.
Continuity mistake: When Will and his date are having dinner at Will's flat, will pours his date a glass of wine into an empty glass that the date is holding out. When the shot changes the date is holding a full glass near his chest, and when the shot changes again, Will is still filling it up.
Continuity mistake: In the episode "24" when Rosario brings the huge popcorn can in, which has Stan's ashes in it for them to scatter, she puts it down in front of the table, at about the center of it. In following shots the location of the can has changed, moving more to the left / right, etc.
Revealing mistake: In reality Deborah Messing is pregnant but her character is definitely not, so Grace has been filmed lately hiding behind big purses, pillows, counter tops, coats, etc. For some reason in this episode there was some rather sloppy shooting where Grace's waistline is concerned: When she and Karen are first entering the cabin, right after Grace says the line '...driving past 20 churches...' she turns sideways and for a few seconds there is a clear shot of her advanced pregnancy. Additionally, when Grace and Karen go to bed (also in the cabin) they have Grace lying on her back so the pregnancy is quite obvious in that scene, too.