Recurring Guest Characters Sketch Player 7 guest appearances Mary Tyler Moore 4 guest appearances Historian 4 guest appearances Betty White 2 guest appearances Narrator 2 guest appearances Christa's Former Student 2 guest appearances Author 2 guest appearances George 1 guest appearances Whitney Houston 1 guest appearances Gary Coleman 1 guest appearances Eddie van Halen 1 guest appearances John Saxon 1 guest appearances Tawny Kitaen 1 guest appearances Patrick Duffy 1 guest appearances Hugh Laurie 1 guest appearances Bea Arthur 1 guest appearances Whoopi Goldberg 1 guest appearances David Bowie 1 guest appearances The Voice of Jefferson 1 guest appearances Narrator 1 guest appearances ⇤ « 1 2 3 4 5 » ⇥