In the Irony Department, last week's show was heavy on the humor-to-drama mix and so when this show started with cheerleader Buf-- er, Liv, and stoner Liv and was playing the humor up, I thought this episode was too funny, especially for two in a row. By the time it was over, it wasn't funny at all any more. But they segued well. And, yeah, all the brains really hit the fan in this episode - the zombie fight with Peyton in the box seats was intense. And Liv lost half her pieces and Blaine has two of them in turn. Really excellent episode.
In the other kind of irony department, though, this excellent episode did make me think of a couple of minor imperfections. Liv's mom and brother either need to guest more or less. They either need to guest so rarely that it's more like a token "she has a family" and their showing up is an event or have them guest more often so that they actually seem a part of things. As is, they just seem random and convenient and don't fit in well. And, slightly bigger: when Liv became a zombie, she quit her job, broke up with her boyfriend, and... moved out of her place and stopped seeing her friend. Right? But, no. Why does she still live with Peyton? It must have made the change even more awkward, Liv runs the risk of having her get bonked on the head or seeing Liv kill bad zombies in the kitchen, and all it takes is a scratch while messing around with the curling iron and we'd have zombie Peyton. So it would have made sense for her to get away from Peyton, too.
But no big deal - I'd rather have Peyton around (assuming she ever comes back).
As far as your season finale idea, it sounds really good. But I thought the Utopium was to create the zombie condition and wouldn't necessarily be required in the cure, itself. If that's the case, it wouldn't work to limit the cure. And that's another thing I wish they'd put on the backburner (said this before, I think) - naturally, Liv having "hope" is good and the cure gives Ravi something specific to do but it would end the show so while I want Liv to be cured and live happily ever after in theory, I hope she can't be cured for several seasons in practice
and they can't string something this front-and-center out for that long. Anyway - we'll see. With or without your scenario, they've got a lot to do in one episode to avoid making the summer hiatus even more brutal than it otherwise would be. Need to get to some decent stopping place quick.