The problem with character actors
Is that I know them by face, not by name. And I'm much too lazy to look them up. You did good with posting a picture with each, as I didn't know any of their names (except Paul Lynde, cause of his Hollywood Squares stint).
The past year I've caught several episodes of Hogan's Heroes, Rockford Files, and Barney Miller and frequently have the same observation - "Oh yeah, I seen him/her in (fill in the blank)." My wife watches "Little House on the Prairie," and I just recently realized that the doctor, Kevin Hagen, had two appearances on MASH.