Continuity mistake: When Will and Jack are having breakfast, in one shot Will pours some milk into his cereal bowl, then puts the milk bottle down on the table, and it doesn't have the lid on it. In the next shot the red lid is now screwed on top.
Continuity mistake: When Karen puts on Tom Jones music on the CD player, she begins to dance. There are headphones on the CD player, with the black wires hanging down in front of the player. In one shot of Karen dancing, the headphones / wire vanishes.
Continuity mistake: After Will and Jack unwrap their breakfast, the pour some of the Smart Start cereal into their bowls, then put the box on the side. Between subsequent shots the box continuously alternates from having it's front / back facing us.
Continuity mistake: After Will and Jack unwrap their breakfast, Jack puts the wrapping that the Smart Start cereal box was wrapped in, on the table. In following shots the wrapping keeps changing position, from spread out, scrunched up, etc.
Continuity mistake: When Will and Grace are standing outside Will's apartment, after Grace arrives back from her honeymoon, Grace is holding a handful of photo envelopes. Between shots the way she holds these envelopes changes.
Fagmalion Part Two: Attack of the Clones - S5-E15
Continuity mistake: Leo brings Grace a cookie bouquet to her workplace, and sets it down on her desk. In following shots, the position of the cookies changes a couple of times, most noticeably as Karen comes out from hiding behind the screen.
Continuity mistake: When Will and Grace are competing in the 'Game Night,' Will is drawing a pictionary on a big white board for Grace. Between shots, during him drawing it, the picture changes. Notice how the lines and shapes are drawn slightly different.
Women and Children First - S5-E17
Continuity mistake: When Jack and Sissy are sitting in his apartment, discussing what they've done with their lives, they both have mint cookies that they eat while they talk. The bites and size of their cookies, most noticeably Sissy's, change between shots.
Fagmalion Part Three: Bye, Bye, Beardy - S5-E18
Continuity mistake: Grace lays out some dresses and accessories on the bed, for Will to choose for her to wear. After Will picks up one dress and takes it over to the mirror, the dresses and accessories on the bed change position between shots.
Fagmalion Part Three: Bye, Bye, Beardy - S5-E18
Continuity mistake: When Karen and Beverly are fighting over the clipboard at the silent auction, in one side shot the clipboards on the table are out of place and untidy. In the next shot the clipboards are back neatly in place like before.
Fagmalion Part Four: The Guy Who Loved Me - S5-E19
Continuity mistake: Karen is pretending to be a maid in her own hotel suite, and she has a big cleaning cart, which has buckets full of items and objects which lay all over the table. As Karen talks with Grace the positions of these items change at various times.
Fagmalion Part Four: The Guy Who Loved Me - S5-E19
Continuity mistake: Karen is pretending to be a maid in her own hotel suite, as she talks to Grace. During her conversation, she throws her feather duster into the pocket, at the end of her cleaning cart. In following shots the position of the duster changes.
Fagmalion Part Four: The Guy Who Loved Me - S5-E19
Continuity mistake: During the scenes with Will and Jack talking to Barry in Jack's apartment, the wine glasses, wine bottle, spoons in the salad bowl, tartlets, tray etc., change position and move about on the table between shots during their conversations.
Fagmalion Part Four: The Guy Who Loved Me - S5-E19
Continuity mistake: When Will enters Barry's apartment with the big brown bag of Chinese food, he walks over to the chair and puts it down. On the table is a magazine laying parallel to a book. A shot later the magazine sits vertically to the book.
Sex, Losers and Videotape - S5-E20
Continuity mistake: After Connie leaves Will's office, we see a stack of files on Will's desk, to his left. Then Grace enters his office, and now these files have vanished from the desk, and are now on the other side of the desk, to Will's right. In following shots they keep swapping sides.
Sex, Losers and Videotape - S5-E20
Continuity mistake: When Will, Karen and Mr. Stine are sitting down for their second love stinks club, in close-ups of Karen, we see her bag is up on her chair to her right, on the seat. But in wide shots the bag has now jumped to the floor, beside the chair.
Sex, Losers and Videotape - S5-E20
Continuity mistake: The water bottle vanishes from table after Will puts it down, when Mr. Stine and Karen arrive.
Sex, Losers and Videotape - S5-E20
Continuity mistake: When Jack leaves his class to go talk to Grace, they are all sitting. As the angle changes we can see through the glass panel that they are all standing and talking to each other literally one second later.
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.
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.
Answer: A history of the game can be found at http://www.fast-rewind.com/bacon.htm.
J I Cohen