Looking for Mr. Good Enough - S6-E14
Continuity mistake: When Karen says "When Agassi was with Brooke Shields, his hair fell out and her show stayed on the air," Will is holding two plates. In the next shot he is holding three. (00:00:35)
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.
Will on Ice - S1-E11
Continuity mistake: When Karen arrives at work, she places her bags on the chair, and then puts them down onto the floor. In a following shot they are back on the chair, then in another shot they're gone again. (00:07:55)
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)
Continuity mistake: After Karen takes the red bag off of Grace's head when they enter the arcade for her birthday suprise, the position of Grace's hair differs in the next closeup.
Hocus Focus - S4-E24
Continuity mistake: Before Fannie starts the photo shoot with Will and Grace, she unbuttons the top of Grace's trousers. But later on in the shoot you can see they're done up, then later on they're undone once again. (00:34:00)
Continuity mistake: When Will runs in and takes a photo of Matt Damon and Grace kissing, to get evidence Matt is straight, when Jack pulls out the film from his camera, two boxes (a black and red one) vanish from the coffee table. (01:20:20)
Continuity mistake: When Karen enters the apartment, the position of the board game boxes on the table change, especially the long white board game box which just out and back into a stack. (00:55:05)
Will on Ice - S1-E11
Continuity mistake: When Will and Grace stand in the kitchen discussing the grey hair, the back of cereal packet (on the counter) faces the camera, but for one shot the front of the packet is showing. (00:00:35)
Continuity mistake: When Will and Grace fight over the birthday cake which Larry holds, it results in the cake being dropped. Note the position of the cake after it is dropped to the floor. In a later shot during their conversation, it has changed.
Someone Old, Someplace New (1) - S4-E17
Continuity mistake: When Jack is making his film for Karen, as he's interviewing Grace, he holds a cheque book up to his mouth. Between shots the book randomly alternates from being in his right/left hand. (01:31:40)
My Best Friend's Tush - S2-E22
Continuity mistake: When Jack is talking to the board manager about kicking Will out of the 'Subway Tush' invention, confetti on Jack's shirt front disappears then reappears, and the confetti on his shoulders differs as well. (00:10:40)
Big Brother is Coming (1) - S1-E14
Continuity mistake: When Will tosses all the ties out of his cupboard, the tie which landed on the end of his bed keeps changing. In some shots it's a blue and black stripy tie, in others it's a yellow and brown stripy tie. (00:08:50)
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.
Dames At Sea - S6-E1
Continuity mistake: When Grace puts her arm around Leo's shoulder after finding out that he has photos of her, the position and angle of the silver bands around her wrist changes. (00:13:20)
The Kid Stays Out of the Picture - S5-E3
Continuity mistake: Grace walks into her office to see that she has a vase of red roses from Leo. During her conversation with Karen about Leo, and during their kiss, the position of the roses sticking out at the top of the bunch changes.
To Serve and Disinfect - S2-E6
Audio problem: When Karen drops the tape box the sound it makes sounds like a tape is still in it, but the tape is still in the VCR. (00:50:40)
Where There's a Will There's No Way - S1-E7
Visible crew/equipment: When Karen enters the office with clothes and bags, Grace says "Oh Karen, you didn't have to buy me clothes," and above her is the whole boom dipping into view. (01:05:40)
Boo! Humbug - S1-E5
Continuity mistake: When the father comes to pick up his children, the plastic pumpkin goody-bag moves from the edge to the centre of the rug between shots. (01:01:00)
Continuity mistake: When Grace and Leo accidentally meet each other in their apartment, ruining Will's surprise, they have a cuddle, then Leo walks over to the fridge. Between shots the back of his collar changes from folded down to folded up.
Chosen answer: I'm not from New York so I can't speak for them, but in Chicago it has happened before. not very often though but I do recall it happening. I have also seen no tickets sold prior to the show at all, it was just first come first served the night of the show. That is very uncommon though.
princesskelli