Continuity mistake: The position of the high heels in the barrel, in the church bazaar differ greatly between shots as Karen enters the room, up to when she walks over to find her slingbacks. No-one else touched the shoes in between. They also change position as Karen kindly gives Sally some extra money. (00:57:25)
Continuity mistake: The amount of frothy foam on top of the protein shake differs through consecutive shots, as Grace is about to drink it, and after she has taken a sip and as Will and she talk in the kitchen area. (00:20:55)
...And the Horse He Rode in On - S5-E1
Continuity mistake: When Karen walks into her bedroom, she pulls her bed sheet up to discover Jack underneath. The bed sheet now hangs down over the end of the bed. between following shots the position of the bed sheet keeps changing.
To Serve and Disinfect - S2-E6
Continuity mistake: When Brian is asking Jack where his steak is, because Jack is waiting and doing a job as a pepperboy in the restaurant, between shots the large wooden pepper grinder which Jack is carrying, vanishes. (00:59:25)
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)
To Serve and Disinfect - S2-E6
Continuity mistake: After Grace plays Karen's adult video, Karen drops her compact, and powder spills all out of it onto the table. In following shots the powder on the desk changes position and vanishes. In addition the compact case also moves too, and when Karen dropped it onto the table it snapped shut but in a following shot it is open again. (00:50:00)
Boo! Humbug - S1-E5
Continuity mistake: When Will and Grace are taking the kids around the flats trick or treating, as Will and Grace enter the lift, the kids stand in the hall and their pumpkin bags have faces, but in the next shot they are plain orange. (00:56:05)
Big Brother is Coming (1) - S1-E14
Continuity mistake: When Will is throwing ties from the closet, we see that they all land on the floor. The angle changes, and one has now appeared on the bed. (00:08:50)
Continuity mistake: When Grace is putting on the waterworks in front of the landlord, to get a lower cut on the apartment, the bowl of tassels on the table is repeatedly full/half full, and tassels jump in and out of the bowl. (00:16:00)
Continuity mistake: After Will and Grace find Karen asleep on the top of the sofa, Karen sits down on the sofa, and puts her beer bottle on the couch next to her. When Grace comes over with her holiday photos, the bottle has gone.
Alley Cats - S1-E21
Continuity mistake: When Rob & Ellen are confronting Grace about how competitive she is, there are several shots of them from the same angle. In some shots there is a red bag visible in the bottom left corner, in others it disappears.
Loose Lips Sink Relationships - S4-E5
Continuity mistake: After Will looks into the mirror, after he puts it down it changes position between shots. (00:06:30)
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)
Answer: A history of the game can be found at http://www.fast-rewind.com/bacon.htm.
J I Cohen