What's with DP chaining twists at the end?  I worried there was going to be some Son of Sam stuff at the conclusion like how shows/movies do to leave the possibility of a future installment down the line.  Certainly a lot of questions remain but with so much going on it's probably difficult to tie everything up neatly.  Still, if Willie's so smart what's he doing hanging with a demon alien?  Where'd Nick go?  How come Polly doesn't recognize Kaysen?  On and on.