Yup, pretty much everything about this movie is tremendous. You guys nailed it all in the write up. Where has Jocelin Donahue been all my life (and what the heck has she been doing since this?)? The entire cast is fantastic. And Tom Noonan, boy oh boy, you don't make them any creepier than him. He does a great bit in a recent episode of Louie that I couldn't help think of watching his performance again here.
And the dancing sequence...it sticks in my mind evertime I think of this movie. Ti West and Adam Winard have perfected the use of one perfect song for their films. Whether it's One Thing Leads to Another in House of the Devil, or Looking for the Magic in You're Next, or The Knife's Heartbeat's at the start of West's latest, The Sacrament, they just nail it with the music.
I hear the soundtrack for The Guest is equally great, but alas, I can't find the damn movie anywhere.
I could go on forever about this movie, but I'll leave it with one last thing: the face of the devil lady/witch. Holy fuck.
(Is the Innkeepers really any good? I tried to watch it a few times and couldn't get very far into it, am I missing something really great?)