Sympathy with your dedication to Lost - I got out of series 1 the week after there was a POLAR BEAR on a desert island, and a week later, no-one had anything to say about it. Grrr! (that's me not the bear). Only David Lynch gets away with stuff like that, because he's David Lynch, dammit!
I loved the way Toby Whitehouse dealt with the cast changes in Being Human, making transcience and survival even more of the story. Some of the new comedy cameos in the last 2 series are worth it for bonkers value alone.