Continuity mistake: In the poker scene at the beginning of the pilot we witness Will, Jack, Rob, and others playing cards. Shortly after Jack asks for "four cards please" watch the bottom left of the screen as a hand (presumably Will's) deals Jack a single card. In the next shot Will appears to have not dealt Jack any cards yet and when he does he gives Jack five cards, add that to the single card he gave in the previous shot and the Ace Jack kept from his original hand and we get a total of seven cards. Two more than Jack should have had if the hand was dealt correctly.
Continuity mistake: Following the argument between Will and Grace when she returns from City Hall, Karen tells Grace she "thinks it's time for a couple of blue bibbies." Watch closely as she removes the lid from the pill bottle, takes out some pills, and puts the lid back on. The scene shoots to Grace and we hear Karen shaking the closed bottle. When the scene shoots back to Karen we see that the pill bottle is open again and Karen closes it yet again.
Continuity mistake: When Grace has the idea to move into Will's apartment, we can see her cup of coffee on the table. Then a little later during their conversation, the cup moves. (00:23:00)
Continuity mistake: When Karen is sorting out her clothes at her work desk, the black sweater hanging over the desk lamp disappears then reappears. (00:26:40)
Continuity mistake: When eating in Will's office, Grace eats salad from a plastic container. Through the scene the salad in the container changes colour, position etc. Also between shots, lettuce appears on Grace's fork. (00:28:05)
Continuity mistake: After Will pours himself a cup of coffee, he places the coffee jug on the sink desktop. In the next shot the jug is visible on the other worktop, beside the gas cooker. (00:35:50)
Continuity mistake: After Karen takes her black top off and throws it down on the table, whilst talking to Jack as they first meet, in following shots the top changes position a few times. (00:37:40)
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)
Continuity mistake: When Grace finally decides to move into Will's apartment near the end, we see Will eating a tub of ice cream. Between shots the ice cream tub lid jumps from being on the table behind Will, to suddenly sitting right in front of him. (00:42:00)
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)
