I can think of 4 people (as a group) The Beatles were mentioned in "Opie's Group" but never appeared on the show.
Einstein, J Edgar Hoover, Rock Hudson, Johnny Unitas, the two guys who they thought were stealin' cows that followed the leader....could go on and on!
I would like to add: Karen Folker, Bruce Newdell, Troy Bowden and Myra Lambert to the list. They are all mentioned in a episode. What episode was it?
Good Rube all were Opies classmates.
So I have a thought on one of these. It's names of people who you never see and Old Man Rimshaw is on this list but technically you see him. His picture is hanging on the wall and his eyes move. Any comments on that?
The Wright Brothers (people laughed them right off of Wright Air Force Base)
Alexander Graham Bell (people laughed at him right over the phone)
These mentioned in "Barneys Sidecar"
Well, if your talking about TAGS characters and not famous people in real life I think the first one I would think of would be Sarah.
Katherine Harney...who Andy had a crush on...and she went to the Prom with Bern Harris.