In the classroom when Laura finds out who shes been partnered with in the marriage project she faints. Then Steve comes in and says "give my wife some air", in this shot Laura is shown passed out with her hands crossed on her stomach. In the next, her arms are stretched out on each side, not crossed.
In the close-up of Harriet saying, "You're doing fine" to Carl, part of his shoulder is visible, indicating they are sitting close together. In all other shots of the scene they are sitting about a foot apart.
Steve approaches Laura, sitting on the couch with a tray of food, to have a talk with her. He picks up the tray and puts it on the coffee table. The glass with the pinkish liquid is toward the right side of the tray. Cut to a close-up of the actors, then back to a wide shot. The pinkish liquid glass is now at the left edge of the tray.
When Steve walks out after making Laura cry. The camera looks back at Laura and shows Steve is still standing there in the doorway. You can see his glasses even though he turned and walked out.
When Laura pushes Urkel off her lap, he puts out his hands to catch himself even though the push was supposed to be unexpected.