Jaleel White makes his first credited appearance as Steve Urkel. He originally signed on just to do a one-time guest appearance, but the producers were so pleased with the audience's reaction to his first taping - there were about 50 frat boys in the audience that were chanting, "Urkel! Urkel! Urkel!" at the end of his first scene - he returned in a recurring role which eventually turned into a starring role. He was also hastily shoehorned into some episodes already completed, but not yet aired, explaining why the Winslow don't seem to know him, though to viewers, he'd been seen a few time already. After his appearance, the show also reached the Top 20.