Full title is "Did You Hear The One about the Traveling Saleslady?"

This 1968 comedy stars Phyllis Diller as a wacky saleslady trying to sell a broken player piano. To fix it, she hires inventor Bob Denver. They team up to win a contest with his invention of a wacky milking machine.

The cute actress who plays Bob's love interest is Eileen Wesson.
Doesn't she look a little like Mary Ann?

Full title is "Did You Hear The One about the Traveling Saleslady?"

This 1968 comedy stars Phyllis Diller as a wacky saleslady trying to sell a broken player piano. To fix it, she hires inventor Bob Denver. They team up to win a contest with his invention of a wacky milking machine.

The cute actress who plays Bob's love interest is Eileen Wesson.
Doesn't she look a little like Mary Ann?

She does at that.
They used to show this a lot years ago as and afternoon matinee on TV here. Another one at the time was "Who's Minding the Mint?"