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 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.