There was a Beverly Hills episode where there was a gorilla in it and I think at the end, Granny dressed the gorilla up in jeans, shirt and straw hat and was forcing it to do chores. Pretty funny stuff. And another one I remember was when they met some Beatnik or Hippie types. They were all fairly good, the golden age of TV comedy.
“Episode Detail: Gorilla - The Beverly Hillbillies
Jethro’s idea of an ideal pet is a gorilla. “
http://www.tvguide.com/tvshows/the-beverly-hillbillies-1966/episode-6-season-5/gorilla/100450