Continuity mistake: When Grace is telling Will about his dad's affair, she mentions that he grabbed the other woman's ass when she brought him a packet of Goobers during the interval. The thing is, she sees them for the first time during the interval, and we see the conversation that follows. The mistress brings him wine, not Goobers, and he doesn't grab her ass.
Lows in the Mid-Eighties (1) - S3-E8
Continuity mistake: When Ellen says to Grace "Okay, what do you mean Will and You have never done it?" the red plastic cup she holds swaps hand three times between shots. (00:45:25)
Continuity mistake: When Grace enters Will's office, while he is spinning around on his new office chair, she goes and puts her black purse down on the desk. In the next shot it is positioned differently. (00:04:30)
Continuity mistake: When Will and Grace are talking to the nun about buying the car off of her, the amount of Burberry scarf showing out of Will's coat is inconsistent with each shot change.
Brothers, A Love Story - S3-E14
Continuity mistake: When Karen reads Stan's will and sees that a third of his money will go to charity, she goes woozy in her chair. In this shot the table is free from loose jewels, yet in the next shot two rings are sitting on the table. (00:10:45)
Continuity mistake: When Will enters the backstage washroom to tell Jack that he can make fun of him on stage, Jack puts the blue flannel in the sink, so that we can't see it. In the next shot the flannel is hanging out, over the sink's edge. (00:17:35)
Continuity mistake: Will squirts Jack with his bottle of water, the water level obviously drops quite a bit, in the bottle. But in the next shots, the bottle is filled right up to the top once again. (00:10:00)
Lows in the Mid-Eighties (1) - S3-E8
Continuity mistake: When Jack invites Pam over to their table to talk, the direction that the label on the champagne bottle faces changes between shots. (00:43:40)
Three's a Crowd, Six is a Freak Show - S3-E10
Continuity mistake: When Grace gets two bottles of beer for her and Mark, she sits down on the sofa with both bottles in her hands, yet in the very next shot one of the bottles has jumped into Mark's hand.
Continuity mistake: After Will squirts his bottle of water all over Jack, the amount of water on his shirt and face differs through following shots. (00:10:00)
Lows in the Mid-Eighties (2) - S3-E9
Continuity mistake: When Will tells Grace he's gay, the champagne bottle on the table keeps rotating.
Lows in the Mid-Eighties (1) - S3-E8
Continuity mistake: When the guy at Will's party tells everyone the beer has gone, everybody leaves, and the guy puts his plastic cup on the handle sticking out from the keg. In the next shot the cup has suddenly gone, then reappears again in the next. (00:46:40)
Continuity mistake: When Will is talking to Jack and is folding tea towels, he folds the same tea towel twice between shots. (00:01:30)
Gypsies, Tramps and Weed - S3-E7
Continuity mistake: When Will, Grace and Jack are having the birthday dinner in the restaurant, in one shot Will picks up his wine glass and commences to drink, yet in the very next shot the wine glass is down on the table.
Continuity mistake: The piece of pizza Will is eating in Grace's office changes appearance during the scene. The topping keeps changing between shots. (00:21:40)
Gypsies, Tramps and Weed - S3-E7
Continuity mistake: Some of the people move around and change psoitions between shots in the background, when Lenny has people dealing drugs in Grace's office.
Continuity mistake: When Rosario walks in on Karen and Beverly fighting on the table, the hairpiece Beverly holds swaps hands between shots. (00:36:15)
Lows in the Mid-Eighties (2) - S3-E9
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 Grace is in the batting cages, she gives Will some money to go buy her a corn dog and some nachos. The door to the cage is wide open, but in the very next shot of Will, the door is locked shut. (01:17:50)
Three's a Crowd, Six is a Freak Show - S3-E10
Continuity mistake: When Grace is in the toy shop, and is hiding in the ball pit from Mark, the colour of the balls around her changes.