This is an incredibly detailed film; every minute is filled with weird comments, dialogue, music, characters, effects, and then more music. The dinner-table conversations (especially the 50's-ish obsession with kitchen appliances), the butcher's goofy rants about his invented language...these are classic!
And the music is -- believe it or not -- good music. It spans many different genres and does a good job in all of them, but watch for the incredibly strange, Devo-esque chemical song; the guy's new wave dance will scare you far more than any of the creepier moments in the film.
As for the plot, who cares? It isn't important; in fact, I don't think the plot is there to keep you interested or to make sense; it's just an instrument to set up weird dialogue, songs, and gags. And yes, though it sometimes tries too hard, it usually succeeds.
Ever wonder what you can do with a lot of talented, enthusiastic nobody's and a miniscule budget? Check it out and see.