After Grannie cuts off the top of Drysdale and Clyburn's (his doctor) hair for some homegrown remedy, Clyburn tries to keep her from ever doctoring again. Meanwhile, the Clampetts are looking forward to the Possum Day parade, which of course isn't celebrated in Beverly Hills, so Drysdale has to figure out how to have one to keep them happy.
Mrs. Drysdale recommends Elly for a high-brow finishing school in hopes that humiliating her will drive the Clampetts away; but instead Miss Hathaway convinces the girls at the school that Elly is a fashion trend-setter. Elly invites the filthy rich Fenwicks over, thinking they're destitute.
Cynthia Fenwick makes her filthy rich mother dress in the "Clampett Look" when they visit the Clampetts, since she thinks Elly is a fashion maven. That only reinforces the Clampett's belief that the Fenwicks are poor.
Jethro decides he wants to go a courtin', so after Jed gives him a little education he finds a woman, who happens to be a stripper. As usual, neither she or the Clampetts know what the other is really saying.
Jethro thinks he's in love with Chickadee Laverne, a stripper he met at the bank. She and the Clampetts have meet and have different ideas about what an "engagement" is, while Miss Hathaway tries to avert this disaster.
Thanksgiving has a hitch when Elly bonds with the thanksgiving turkey so the family can't bring themselves to kill it, while Mrs Drysdale hires some Indians to take a thanksgiving picture and it puts Granny on the warpath.
Mrs. Drysdale has a garden party and 'invites' the Clampetts by mistake. They end up back by their 'cement pond' to handle the 'overflow' from Mrs. Drysdale's party. A gun shot by Granny starts the real party.
Mr. Drysdale is having a ground-breaking ceremony for a new bank building and the Clampetts think they need to pitch in to help build it. Meanwhile Mr. Drysdale's associates try to get stock market tips off of Jed.
The Clampetts get a big food package from home and Mr. Drysdale's two associates, Mr. Lucus and Mr. Pendleton, think that the crawdads have something to do with the development of military reconnaissance technology.
Mr. Drysdale wants Jed to incorporate for the tax advantages. So the Clampetts take over the top floor of the Commerce Bank and start doing what they can to stimulate the economy by getting more money into the hands of more people.
Mr. Drysdale get's Jed's old cabin from back home and sets it up in the Clampett's backyard to surprise Granny on her birthday. A coed with a sociology major thinks that they live there as the Drysdale's servants.
Mrs. Drysdale hires a demolition man to remove the Clampett's cabin. Mr. Drysdale decides to occupy the cabin so it can't be removed. The Clampetts think a "home wrecker" is breaking up the Drysdale's marriage.
Jethro's running late for his graduation ceremony despite his new watch. Mrs. Potts of Jethro's school is afraid that his attendance will jeopardize her chances for a new endowment. Cousin Bessie saves the day.