In the episode "Missionary Impossible" when Betty White is asking for donations, you can see many other characters from FOX shows manning the phone lines: Bender from "Futurama", Hank Hill from "King of the Hill", Thurgood Stubbs from "The PJ's", Mulder from "The X-Files", and Luke Perry from Beverly Hills 90210. Also the owner of FOX, Rupert Murdoch is answering phones, and when Betty White turns off the TV the Family Guy logo is on it.