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.
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.
Continuity mistake: When Karen is the bar, about to pay 'Smitty,' she takes out her purse, takes out her credit card and places her purse on the barside. In the next shot the purse has vanished and the credit card is suddenly in 'Smitty's' hands
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.