Jed tells Jethro that he invited his mother Pearl and his sister Jethrine (Max Baer Jr., voiced by Linda Kaye Henning) to come for a visit.
When the headmistress, Mrs. Millicent Schuyler-Potts (Eleanor Audley), sees Jed and Jethro, she thinks someone is playing a practical joke on her.
After calling Drysdale, who holds the mortgage on the school, she finds out Jed is rich and she warms up to the idea of enrolling a Clampett boy.
James and Mabel Johnson (Murvyn Vye and Kathleen Freeman) back into the Clampetts' car outside of the Commerce Bank.
Elly invites the filthy rich Cynthia Fenwick (Joanna Barnes) and her mother (Doris Packer) over for dinner, thinking they're destitute.
Mr. Drysdale learns that Candy Davis (Susan Hart), one of the Commerce Bank secretaries, will be a contestant for Queen of Beverly Hills.
Miss Jane tells Jed that she'll call Lawrence Chapman (Milton Frome), the head of the studio, and arrange a tour.
Chapman wants to make Jed happy so he decides to put Elly in the Dr. Jekyll movie and let Jethro think he's a producer.
Biff arrives and brings Bolt Upright (Jack Bannon), Crunch Hardtack, Race Burley and Tab Strong.
All episodes from Season 4 onwards now filmed in color Granny's fear of sharks makes her reluctant to go yachting with the rest of the family.
The family heads off to meet Drysdale and Miss Jane at the yacht harbor, but mistakenly wind up at a Naval ship yard.
At the school, Colonel G. T. Hollis (John Hoyt) speaks with a young Captain Hogan about the upcoming war games with rival academy Lexington.
Stafford Clark (Gavin Gordon), the head of the soup company and Roger Dickerback (Stephen Dunne), a representative of the advertising agency come by the mansion.
Drysdale, fearing potential embarrassment, asks John Brewster (Frank Wilcox) to put Jed to work on the board of directors of O.K.
Brewster discovers that oil losses in a Beverly Hills section of a pipeline are due to the Clampetts accidentally tapping the line.
Jed decides to use the company's airplane to start an airline service, complete with wooden benches and ropes for seat belts.
Granny misinterprets a phone call from Cousin Pearl and believes Indians have attacked Bug Tussle and have taken over Clampett oil land.
Miss Jane says that Chief Running Wolf and Little Fox (John Considine) will travel to Beverly Hills to settle the dispute with Jed.
An Army Psychiatrist (King Donovan) tells Stark that he thinks Jethro is a genius in the way he pretends to be crazy to avoid military service.
While heading to the Clampetts for Jethro's farewell breakfast, Drysdale tells Miss Jane more about his Money Man Comic books.
Granny overhears Blake talking to the men portraying General Grant (William Mims) and Col. Chittlen (Harry Fleer) about battle plans.
Miss Jane tells Elly about a soap opera she's going to watch with a character named Dr. Rex Goodbody (John Dehner).
After the Clampetts return from London, Granny gets a letter from Hooterville asking her to help with Betty Jo Elliot's baby.
Guest stars from Petticoat Junction: Edgar Buchanan as Uncle Joe Carson and Frank Cady as Sam Drucker Granny is still in Hooterville and Elly is doing the cooking.
Guest stars from Petticoat Junction: Linda Henning as Betty Jo, Mike Minor as Steve Elliott, and Frank Cady as Sam Drucker Cheap Mr. Drysdale wants Miss Jane to cook one turkey for his 65 employees.
To keep the Clampetts in Beverly Hills, Drysdale gets Hollywood actor Dash Riprock (Larry Pennell) to play homespun country boy Homer Noodleman.
At the bank, Homer Cratchit (Percy Helton) hands Drysdale a written request by the employees to be allowed to leave early for Christmas.
Sam Drucker wins a trip to Beverly Hills and Bobbie Jo sends a telegram to let the Clampetts know.
Meanwhile, Drysdale wants his real estate agent Fred Hutchins (Dave Willock) to buy up land in the mountains where he thinks Jed has found more oil.
Miss Jane is mad at Drysdale for making Elly's chimp walk around town with a wearable sandwich board advertising the bank.