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)
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)
Boo! Humbug - S1-E5
Continuity mistake: When Will grabs the silly string from the table, he pulls off the yellow lid and drops it to the floor. In the next shot the lid is on the coffee table. It alternates from on the table/floor for a few following shots as well. (00:59:25)
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)
Boo! Humbug - S1-E5
Continuity mistake: When the silly string fight happens, you see Nixon's can run out of string and he puts it back on the table when he takes off his mask. But when Will and Grace run back to grab the jaw-breaker, the can is suddenly full again as Will shoots Grace with it. (01:01:00)
Boo! Humbug - S1-E5
Continuity mistake: At the end of the episode, "Buzzy Wuzzy" takes her bee mask with her and they leave. But when Will and Grace dive for the jawbreaker, the bee mask is back on the coffee table. (01:01:25)
Boo! Humbug - S1-E5
Continuity mistake: When Will and Grace dive for the jawbreaker at the end of the episode, the silly string sprayed around the room (on the table, trolley, fireplace mantle, etc.,) is different from the previous shot of the room. (01:01:35)