Huh. Maybe I should've watched better--the only thing the film suggested to me was glorious 1970s crap! I was watching for Moe (obviously), so any "plot" was conveniently ignored, but constant laughter? Yup. Seeing as they weren't intending to make a comedy, what were they smoking when they came up with that one? (Yeah, I know...there were plenty of drive-ins that needed fare.)
That being said, it's a great movie to watch with a group....even better with a large group! Let the riffing and snarkage begin!