Revealing mistake: In the scene when Will brings out the turkey, Karen clearly says "my God, this scene is so long!" Apparently Megan Mullally said it on every take due to the length of the scene and the amount of times they had to reshoot it.
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. (00:21:25)
Continuity mistake: When Grace and Karen are sitting around Sal at the dinner table, Grace pours out a glass of champagne for him. In the first shot the glass is 3/4 full, but in the next shot it's only about 1/4 full. (00:31:30)
Continuity mistake: After Jack tries to take a bite out of the wax lemon, he puts it down on the table. A few shots later it is no longer on the table in front of him, then reappears for one shot in front of him, the disappears again. (00:03:30)
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. (00:00:30)
Saving Grace, Again (2) - S7-E9
Continuity mistake: When Rip throws the confetti and it lands all over him and the Out TV executive, the amount and position of it, on their clothes, differs between shots during the scene. (00:07:15)
Saving Grace, Again (2) - S7-E9
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. (00:03:35)
Saving Grace, Again (1) - S7-E8
Continuity mistake: In the coffee house scene, with everybody sitting at the table talking about Grace going back to dating - there are two muffins on the table, and by the end of the scene (instantly between shots) a bite appears in the muffin in front of Jack. (00:02:10)
Continuity mistake: At the start when Will and Grace are in the kitchen, when Grace goes to the fridge her bottle of water sitting on the counter rotates itself between shots. (00:01:00)
Continuity mistake: When Will and Grace come back from the gym they go straight to the kitchen. Grace has a bottle of water, and she unscrews the cap and then picks up a sachet and starts pouring it in the water. But then in the next shot she is still unscrewing the bottlecap. (00:00:25)
Will & Grace & Vince & Nadine - S7-E7
Continuity mistake: At dinner when Will stands up from the table, as Nadine is saying she hates him - he throws his white napkin down on the table, by his placemat. In the next shot it has disappeared. (00:10:50)
Will & Grace & Vince & Nadine - S7-E7
Continuity mistake: When Grace compliments Will for the chicken at dinner, in one shot she puts in bone down on her plate, then in the next she is still chewing it and then it is back down again. (00:09:05)
Continuity mistake: When Karen and Rosario enter Jack's office and put the Cher doll down on his desk, the boa that's on the doll is falling off the shoulders. A few shots later the boa is back in perfect position around the dolls shoulders, though no-one touched it. (00:11:40)
Continuity mistake: When Grace is talking to Val at the AA meeting room, Val's arms keep changing from outstretched, down or crossed. (00:03:30)
Continuity mistake: When Grace is in the AA meeting getting the free donuts, the donut and napkin she holds keeps swapping hands and then a little later when she is talking to Val, the amount of donuts and napkin she holds changes too. (00:03:10)
Continuity mistake: When Grace is sitting on the sofa looking at her Wedding album, the ice cream tub beside her rotates itself between shots. (00:16:45)
Answer: A history of the game can be found at http://www.fast-rewind.com/bacon.htm.
J I Cohen