Don't forget Chatsworth's "Mummsy" played I believe by Doris Packer. She always referred to Chatsworth as "such a nasty boy." Beatty played Milton Armitage, a less amusing rich kid. Also, William Schallert played Mr. Pomfritt, their high school teacher. Frank Faylen was Herbert T. Gillis, and Florida Friebus was Winnie Gillis. Herbert always used to talk about his "good conduct medal." Also would always say about Dobie "Someday I gotta kill that boy, I just gotta." Wonderful show.
Bill Schallert later went on to fame with Patty Duke's show and even the "Nancy Drew" show in the late 70's. Warren Beatty hit the jackpot with "Bonny and Clyde".
And Dwayne Hickman got his start as Bob Cummings' nephew in "Love That Bob".