The actor listed as "man" is Bea Benaderet's son Jack Bannon. As we all know she played cousin Pearl in the earlier episodes of the show.
Virginia mentions that the Clampetts live on Crestview Drive. The only Crestview Drive in the Los Angeles area is in Santa Clarita. The Chartwell Mansion, where the exteriors were shot, is actually on Bel Air Road. She does correctly assess the size of the estate as ten acres. There is a Crestview Drive in Los Angeles the ZIP Code is 90046. It's not far from Beverly Hills.