In the Coy and Vance episodes, Coy throws Vance a dish to be dried. Uncle Jesse does a pointing thing while his name appears on screen. Only problem is this scene only takes place in the intros, not ever in an episode, unlike all the other scenes.
Sheriff Rosco P. Coltrane's middle initial has been added to his name during the opening credits, but this only lasts as long as Coy and Vance are on the show. When Bo and Luke return in Welcome Back, Bo 'n' Luke (1983), Rosco's credit reverts to "Sheriff Rosco Coltrane".