Which episode is it?
The one where they have insomina (I think). And during one scene, they start dancing (I think there's a mariachi band), between each sentences of a conversation, they're having in the living room, lol.
shareFrom your description, I think it could be one of two episodes.
The first possibility is Season 2's "Up All Night." Jamie drinks too much tea and can't sleep. She and Paul end up dancing a tango with John Astin (Gomez Addams) in his rooftop apartment.
The other option is Season 4's "Dream Weaver." It shows a series of dreams Paul and Jamie are having one night. The final dream sequence is a "Laugh In"-style party in the living room where everyone is dancing the frug.
Do either of those sound like what you're thinking of?
A good man is like a good cup of coffee--hot, strong, and sweet.
I was utterly amazed that for "Dream Weaver" they had gotten several actual "Laugh In" cast members -- Jo Anne Worley, Henry Gibson, Arte Johnson, and Gary Owens -- who looked hardly any older than they had 25 years earlier.