When Granny hears the Drysdales are at a horse show she declares she wants good trotter so she can ride it to the market. But Mr. Drysdale buys a racer along with a buggy which Granny decides she wants to be the driver at the track.
The Clampetts believe resuming his courtship of Elly is why Sonny Drysdale returns. But his stepfather arranges a job as a beauty product salesman and his first stop is at the Clampetts where they think his merchandise are courting gifts.
Granny, along with Elly, is heading back to the hills to do some doctoring. Mr Drysdale is frantic to stop her so he reveals that the Brewsters are having a baby. Jethro brings home some girls from the Kit Kat Club so he won't be lonely.
Jed thinks Granny needs help in cleaning the mansion but she believes it's because he wants to put her in a retirement home. So Granny is ready to head to the hills with her money which Mr. Drysdale is desperate to avoid.
Musicians Flatt and Scruggs, old friends of the Clampetts, visit with their glamorous wives. Banjo music is performed, Gladys sings a song and Granny teaches her to cook. Jethro adapts the truck to avoid traffic.
Drysdale, at first irate that beautiful actress Bergstrom is kept on an expensive stipend without making a film, is smitten at first sight and so places the actress in the Clampett home to learn backwoods accents and ways for a movie.
Granny remains eager to get Elly to the altar and decides Professor Biddle, Miss Jane's friend, will do. Mr. Drysdale blackmails Dash into asking the Clampett lass for a date. The meek birdwatcher and the handsome actor are soon at odds.
Jethro is in love again and decides to get a job as an actor. Taking the name Beef Jerky, he finds himself Dash's stunt double and has a rough time at the studio. Jethro's "girl" Debbie only want a screen test and plays up to Jed.
Granny brews a batch of her tonic hoping it helps Elly get a husband. Jane with Mr. Biddle are trying to hatch a condor egg but a sip of the potion changes the birdwatcher's focus and the Clampetts need to get him out of a tree.
Jed thinks Jethro needs to go back to school to get his mind off girls. But instead of college Jethro enrolls in a secretarial school who take his money and graduate him early. At his new bank job he hires all his classmates.
Granny receives a box from Cousin Pearl in the hills. One of the items in the box is an old fashioned crank telephone. Granny asks Jethro to hook it up to a party line on the pole so she can listen in on the party line.
Jethro is in love with Susie, the carhop waitress at the local drive-in, but Susie keeps rejecting his advances. Jed advises a dejected Jethro to take dating advice from Dash Riprock, the movie star/playboy neighbor to the Clampetts. Dash advises Jethro to buy a convertible, invite Susie to go on a double date with Elly Mae and him, and even lets Jethro use his bachelor pad. Despite Dash's efforts, Jethro still can't get past his hillbilly ways to Susie's heart.
Jethro decides to sophisticate Emaline but she has bigger plans for blackmailing Mr. Drysdale with her cuckoo clock camera. The colonel continues to woo Granny. The two swindlers though haven't met someone as sharp as Jed.
Granny's soap making is sending noxious smoke into the air which gets the attention of smog commissioner Tinsley. He shuts down the operation and Jed decides to run against him when he misunderstands Mr. Drysdale's advice.
Cushing makes another attempt to get the Clampetts to move their money to his bank by romancing Granny. When Drysdale learns of this, he decides to bring his father-in-law Lowell Farquhar, who had once dated Granny, to draw Granny away from Cushing.
Gloria Swanson and Drysdale are doing some business which involves her selling her house and some of her possessions and donating the proceeds to charity and she's moving East. When the Clampetts read about her moving away,Jethro who heard a story that she's auctioning of her things think that she's broke and that she's being forced to sell her possessions Granny being a big fan is heart broken. They go to see her and try to life up her spirits by saying they like her movies and that they're still being shown in their hometown. Jed decides to ask Chapman to make a ...
Flatt and Scruggs are visiting to film a TV commercial for a detergent. Commodore Ratterman thinks the Clampett authenticity would help sell the soap. He doesn't count on their honesty or Jethro's incompetence as a director.