Paul Lynde and Bernard Fox actually played other characters previously on that show before Uncle Arthur or Dr. Bombay. Lynde played a driving instructor and Fox sort of a professor / philosopher type character.
Yes and on shows like MASH, All in the Family and the Sopranos actors turn up in
small roles then show up as different
characters in other roles
All in the Family—Allan Melvin as police
sgt, Barney Hefner
MASH—Harry Morgan as insane general then
Col Potter
Sopranos—Joe Giannoscoli as bakery
customer then Vito Spadafore