When Carl jumps up from the couch, one of the cushions is displaced in a raised position. It replaces itself between shots.
When Laura commends Mike for taking a risk, she puts her hand on his knee. When she says, "You tickle me!" she puts the same hand on his knee again.
Although Urkel is buried up to his chin in sand and can't move, he is somehow able to use his satellite phone to call the concierge and then Rachel.