It's established in this episode that Jethro is either 17 or 18 years old (since Jed says that it will be "three or four years" before he turns 21). That makes Jethro about the same age as Elly May, who is 17 (or, as Granny put it,"almost 18").
In reality, Donna Douglas was five years older than Max Baer Jr. In this first season, she was 30 years old, and he was 25, both looking much older than the purported ages of their characters.
Both Donna Douglas and Lola Albright starred in Elvis Presley movies. Donna Douglas in "Frankie and Johnny"(1966) and Lola Albright in "Kid Gallahad" (1962).
Due to CBS not renewing the copyright, the entire 1st season and a portion of the 2nd are in the public domain. The remainder of the show retains its copyright.
This show's copyright has expired and it is now in the public domain.
The Commerce Bank of Beverly Hills has Jed Clampett's (Buddy Ebsen) bank account at $34,783,127.34, not including the next deposit from the oil company.