Lots of Famous Actors in Season 1
We've only watched the first 12 episodes of Season 1 so far, but my wife and I have noticed that practically every episode has a famous face:
Ray Walston (My Favorite Martian, Fast Times at Ridgemont High)
Michael Landon, Jr.
Leif Garrett
George Chakiris (West Side Story)
Abe Vigoda (The Godfather, Barney Miller)
Sonny Shroyer (Dukes of Hazzard)
Anyone else famous on the show, aside from George Lazenby (James Bond), who later plays Jor-El, and Britt Ekland as Lara ?