Three cast members of "Leave It To Beaver"guest starred on "My Three Sons".Name them.

I know two:

Jerry Mathers played Joe Lawrie in "Love Thy Neighbor."
Tony Dow played Gilbert Thornbury in "Guest in the House."

And,there was one more:Rusty Stevens played Cletus(kind of like the flip-side of his nice guy "Larry Mondello"character on "Leave It To Beaver")the obnoxious brat Bub waited on in "Bub Gets a Job".

Jerry Mathers played Joe Lawrie in "Love Thy Neighbor."

Jerry sported a moustache in that episode. An interesting look at him from those years (very late '60s).

Tiger Fafara (Tooey) was in the 'Fire Watch' episode from season 1.

Jerry sported a moustache in that episode. An interesting look at him from those years (very late '60s).

I caught that episode a couple of weeks ago, it was interesting to see Beaver suddenly "grown up" and married just a few short years from the Beaver era, still playing the same "character" as always.

And,there was one more:Rusty Stevens played Cletus(kind of like the flip-side of his nice guy "Larry Mondello"character on "Leave It To Beaver")the obnoxious brat Bub waited on in "Bub Gets a Job".

I don't think Larry Mondello was very nice really. Like most of Beaver's friends, he frequently behaved selfishly and got Beaver in trouble.

Unrelated, but I just saw the episode of My Three Sons (Good Guys Finish Last) which co-starred Jay North (Dennis the Menace).

:)

Some guest stars on "Leave it to Beaver" also appeared as guest stars on "My Three Sons":

Barbara Parkins, who co-starred with Patty Duke and Sharon Tate in "Valley of the Dolls," appeared as Judy Walker in "No Time For Babysitters" on LITB and as Roberta "Robbie" Anderson in "Coincidence" on M3S.

Ryan O'Neal, who starred on "Peyton Place," appeared as Tom Henderson in "Wally Goes Steady" on LITB and as Chug Williams in "Chug and Robbie" on M3S.

Chrystie Jordan appeared in two Leave it to Beaver episodes: as Donna Yeager in "More Blessed to Give" and as the "papergirl" in "The Late Edition." She also appeared in My Three Sons as Diana Ferguson in "Tramp the Hero." Ms. Jordan appeared in two other M3S episodes as Ernie's friend.

Keith Taylor, who appeared as Harry, Beaver's friend, in several LITB episodes also appeared in "Tramp the Hero" and "Chip's Composition" as Freddie, one of Chip's friends.

Candy Moore was in the Fire Watch M3S ep. from season 1, and was in the Cleaning Lady ep. from LITB season 4.

Of course, these character actors appeared in a lot of sitcoms.

Unrelated, but I just saw the episode of My Three Sons (Good Guys Finish Last) which co-starred Jay North (Dennis the Menace).

Jay also appeared around that time (seasons 6 or 7) in the episode about Chip's hair, where Jay is at the barber shop with him and comments that Chip's is "really long." This was the one where Steve returns from a long trip to find that Chip now has shoulder-length locks...!

A couple of LITB regulars or semi-regulars, Richard Deacon and Cheryl Holdridge, also had My Three Sons appearances.

Any LITB people appear on both M3S and Family Affair? I was thinking about that when watching Randy Whipple from My Mother the Car, but while appearing in the Fedderson shows, I don't think he had an LITB appearance (too young for one thing).

I might add that Burt Mustin, who had a recurring role on LITB as Gus, the fireman, also made an M3S appearance (in Season 10).

And Veronica Cartwright, who was Violet Rutherford IIRC, appeared in Season 11 of M3S. So she answers my previous question, making appearances on LITB, M3S, AND Family Affair.