The Best Celebrity Cameos and Appearances in 'Friends'

The More You Know

• The Mary Tyler Moore Show was a trailblazer in bringing feminist issues onto the small screen, depicting Moore as a single female striving to make it in a male-dominated workplace.
• The Office: Phyllis Smith, who plays Phyllis Vance, was initially an assistant casting director for the show.
• Buffy the Vampire Slayer: It was the first show to use the word "Google" as a verb on TV.
• Americans annually watch around 250 billion hours of television.