One of the neat things about it was seeing future "stars" in bit parts.

"The series featured such soon-to-be-famous actors as Robert Redford, William Shatner, Burt Reynolds, Robert Duvall, Dennis Hopper, Carol Burnett, James Coburn, Charles Bronson, Lee Marvin, Peter Falk and Bill Mumy, as well as such established stars as silent-film giant Buster Keaton, Art Carney, Mickey Rooney, Ida Lupino and John Carradine."

From: http://www.scifi.com/twilightzone/