Continuity mistake: In the episode "24" when Rosario brings the huge popcorn can in, which has Stan's ashes in it for them to scatter, she puts it down in front of the table, at about the center of it. In following shots the location of the can has changed, moving more to the left / right, etc.
...And the Horse He Rode in On - S5-E1
Continuity mistake: When Grace and Leo are speaking at the table in the coffee shop, the muffin on the table keeps changing position, and Grace's hand keep jumping on and off of it between shots. The bites taken from it also differ.
...And the Horse He Rode in On - S5-E1
Continuity mistake: While in the coffee shop, Leo writes Grace a prescription. As she is reading the piece of paper, Leo puts the prescription pad back into his shirt pocket. In the next shot the pad is on the table in front of him.
...And the Horse He Rode in On - S5-E1
Continuity mistake: When Leo helps Grace after she runs into the lamppost, the camera alternates between two angles. Between these different angles, a park bench, beside Leo's white horse, disappears and reappears constantly.
...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.
...And the Horse He Rode in On - S5-E1
Continuity mistake: When Grace and Leo are speaking at the table in the coffee shop, the brown paper bag laying on the table in between them keeps changing position and also keeps alternating from being open to closed.
...And the Horse He Rode in On - S5-E1
Revealing mistake: At the beginning of the episode, Grace is running through the park, and she unexpectedly runs right into a lamppost. When she hits the lamppost, the lamppost shakes very violently, like a cheap set lamppost.
Bacon & Eggs - S5-E2
Continuity mistake: When Leo comes into Grace's design workplace, he starts to put pieces of cloth on his shoulder. Between shots, before Grace takes the pieces of cloth off of him, they change position on his shoulder completely.
Bacon & Eggs - S5-E2
Continuity mistake: When Jack and Will are outside behind the hedges, stalking Kevin Bacon, Jack hands the binoculars over to Will. Will holds the binoculars with one hand in one shot, but in the next shot he has both hands on them.
Bacon & Eggs - S5-E2
Continuity mistake: When Kevin Bacon is talking to Will about the cardboard cutout, Kevin throws the cutout down and it lands flat on the floor. In later shots the cutout is now leaning up against the fireplace. Then, later, it completely vanishes.
The Kid Stays Out of the Picture - S5-E3
Continuity mistake: After Will opens his present from Grace, he puts the black "Sharper Image" bag down on the table. In following shots, the position of the bag has changed, it rotates and changes from open to closed, and vice versa.
The Kid Stays Out of the Picture - S5-E3
Continuity mistake: When Will and Grace exchange gifts to each other, Grace unwraps hers. She puts the box and wrapping down on the table. In following shots the face of the box showing has changed and the wrapping has changed position too.
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.
Continuity mistake: After Will and Grace make Larry drop the birthday cake, there is a black woman standing behind then, an a green shirt. As Will and Grace then start to shout at each other, the woman walks away three times between shots.
Continuity mistake: After Jack and Karen have locked Will and Grace in the bouncy castle, Grace throws her black purse down into the corner, then her and Will start talking. During their conversation the position of the purse keeps changing.
Continuity mistake: After Jack and Karen have locked Will and Grace in the bouncy castle, they talks to each other through the netting. Between each shot, Grace's purse constantly moves from on her elbow, to up on her shoulder.
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.
It's the Gay Pumpkin, Charlie Brown - S5-E5
Visible crew/equipment: When Grace has stopped and is trying to fix her bike, a red car passes her, splashing up mud all over her. As the car passes the camera, the whole crew and equipment is clearly reflected in the side.
It's the Gay Pumpkin, Charlie Brown - S5-E5
Continuity mistake: When Leo comes into the apartment and starts talking to Will and Grace, they're sitting at the table. Grace has a newspaper which she holds over her plate. Between shots the newspaper keeps vanishing then reappearing.
It's the Gay Pumpkin, Charlie Brown - S5-E5
Continuity mistake: When Will and Grace are on the biking trip with Leo, going to pick a pumpkin, during Will and Grace's conversation the scenery and background behind and around them keep alternating and changing between shots.
Answer: A history of the game can be found at http://www.fast-rewind.com/bacon.htm.
J I Cohen