Hey, It's That Guy!: A 16-year old Davy Jones appeared in the play Oliver the same night The Beatles made their American debut. He would later be known three years later as one of The Monkees.
Germans Love David Hasselhoff: Topo Gigio is an Italian mouse puppet who made regular appearances on the show, but became a superstar in Latin America thanks to his long running variety show which had various incarnations beginning in the 1960s up to at least the 1980s.
Screw This, I'm Outta Here!: Bob Dylan was slated to make his first nationwide television appearance on the show in 1963, but walked out when the show's producers told him he couldn't sing his intended song, "Talkin' John Birch Paranoia Blues", due to its then-controversial references to communism.