The question of Will They Or Won't They? Has finally been resolved, and it looks like They Will. This is a pretty gutsy move: it could have been a shark-jumping moment, as with Moonlighting a few years later. The writers avoid this trap by making it clear that while Sam & Diane are together, it sure ain't Happily Ever After.
The episodes begins where the Season One finale ended, with our leads declaring their love (or at least lust) for each other. The rest of the bar is skeptical, and the two run off to prove them wrong. Almost immediately things go South.
It's simple, really: Sam acts entirely on instinct, while Diane analyzes everything. They can't even agree on a place to consummate their relationship. They settle on Diane's apartment, but even then it's an ordeal.
The episode mirrors the previous one, with a few (pretty funny) bar scenes leading to another two hander final act where our lovers eventually, finally go to bed. It's goofy, it's frustrating, and it's a bit sexy. Kind of like the show itself.