Continuity mistake: When Malcolm enters the steam room, joining Jack and Stan, when he walks forward and says to Stan "I'm sure you've heard all about Karen and I", a huge blast of steam engulfs him (drowning out Stan's reply). In the very next shot all the steam has instantly cleared.
Audio problem: When Will and Grace are outside talking about the will Grace is going to write up, they sit down on some steps for a few minutes. When they stand up, Grace says "Now come on, why don't you accomplish us a couple of hot dogs," yet the line is clearly dubbed and her mouth is not in sync.
Continuity mistake: When Grace and Tom are looking at the designs for his hotel, there are papers, books and fabrics spread on the table that move around a few times - especially the book near the side of the table which is open, then closed and then reopened.
Continuity mistake: When Grace is sitting with Marilyn, Marilyn starts putting little sandwiches on a plate for them. Between shots she puts them on the same plate three times and then the plate is instantly on the table in front of Grace in the next shot.
Continuity mistake: When Karen sits down at the bar at the Valentine dance and Beverley Leslie pops up and frightens her, she pulls her hands back from the bar but in the next shot her right hand is back on the bar. Also the position of the strap on her purse, that sits on the bar, changes a few times.
Continuity mistake: After Jack has shouted at Patti LuPone to be quiet so he can talk to Will, as Will is thanking Jack as the shots change, the teapot that sits on the table between them continues to change whether it's facing left or right. The items around the teapot (cups, food on plates, etc.) also differs.
Continuity mistake: When all of the board members leave the room after reconsidering their vote and giving it to Karen, when the shot changes and Scott enters the room, note that now all of the files on the table and the chairs around the table are in completely different positions.
Continuity mistake: When Grace and Jack are talking to Vince in the Organic Grocer's and they find out he now works there, as Vince walks away from the cans he was stacking, he walks past a table with jam jars on it. In the next shot the position of some of the jars has changed.
Continuity mistake: When Annette is talking to Will in the kitchen about him having to be one hell of a guy for Vince, there is a paper circle on the floor under the kitchen's centre table. When Jack enters the room, the paper has vanished and also a large glass bowl has appeared on the tabletop.
Continuity mistake: In the opening scene when Grace, Karen and Jack sit at the breakfast table waiting for breakfast to be served, the napkin on the table in front of Grace keeps changing from sitting parallel to or facing away from her, the two crockery items on the table keep moving as well, as do the artificial fruits in the bowl.
Continuity mistake: When Karen and Jack are in the Peninsula Hotel, when Margaret, the receptionist rings the bell after giving Karen her suite card, there is nothing on the counter. In the next shot there are papers sitting on the desk right beside the bell.