When Urkel says he's tired of being bullied by the girls, his arms are crossed over his waist. In the next shot, his hands are clasped together.
When Urkel says he thinks he's cured of hiccups, he reaches out and puts a hand on Carl's shoulder. The camera then focuses on Carl and Urkel's hand is not there.
When Carl asks Harriette to be the referee for his and Eddie's arm wrestling match, the boom mic drops into the shot a few times.