The mansion in Beverly Hills where the Clampetts lived was actually the Kirkeby mansion in Bel Air.
An agreement was made between Filmways Productions and Arnold Kirkeby to film the exterior of the Kirkeby mansion. The agreement stipulated that the grounds had to be cleaned up after filming, and the address of the Kirkeby mansion was never to be divulged to the public.
Just before the fourth season got underway, Mrs. Kirkeby apparently broke the agreement her late husband had made with Filmways Productions, since the mansion's address was leaked and caused an endless stream of tourists to come to the mansion looking for Jed and Granny. Filmways was not allowed to film the mansion's exterior or film any long shots of the mansion grounds after that.
The 1971 cancellation of the series resulted from CBS' desire to erase its image as a "rural network." In the process, other rural shows (including "Green Acres" (1965) and "Petticoat Junction" (1963)) were canceled as well. The general feeling was that "CBS canceled every show with a tree in it".
Jed Clampett was originally written as a rather dumb hick, but Buddy Ebsen would only agree to take the role if it was rewritten to make Jed smarter. The character of Jethro was written as someone to give all of the "dumb" Jed's lines to.
The Clampett's truck was a 1921 Oldsmobile. It was loaned by Cousin Pearl when the family moved to California.
John Wayne made one cameo appearance on "The Beverly Hillbillies" (1962) The Indians Are Coming (1967). When asked how he wanted to be paid, his answer was: "Give me a fifth of bourbon - that'll square it."
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