Continuity mistake: When Will introduces Grace to April, the pencils in Grace's hair changes between shots.
Between a Rock and Harlan's Place - S1-E4
Continuity mistake: When Will and Grace are eating dinner, Will has his knife and fork in his hands, but in the very next closeup he his wine glass in his hand. (01:05:00)
The Big Vent - S1-E9
Continuity mistake: After giving Will and Grace his scripts to read, Jack places his drinks bottle on the table and walks over to the door. When he reaches the door he suddenly has the drinks bottle in his hand, although he left it on the table across the room. (00:47:00)
Continuity mistake: When Will is sorting his CD's, Grace enters the flat and puts her bag on the sofa with the back facing out and it is all black. When Will gives Grace a glass of wine, the front of the bag is facing out, with the flower design. (00:05:10)
Boo! Humbug - S1-E5
Continuity mistake: When Jack and Karen are downtown on the streets, Karen wears a red shawl, and in one shot she pulls it up so it is over her shoulders, but in the next shot it is down by her elbows. (00:53:25)
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)
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)
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.
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: 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)
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)
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)
Big Brother is Coming (2) - S1-E15
Continuity mistake: Several parts of the mess in Will's apartment keep switching places. Look at the glasses and napkins. (00:20:45)
Continuity mistake: When we first see Grace in her apartment with everything in place, there is a peach coloured chair with a red sheet thrown over it, which changes position in the next shot. (00:39:10)
Answer: A history of the game can be found at http://www.fast-rewind.com/bacon.htm.
J I Cohen