Poor Dean - he finally gets some and it goes to crap.
I think they have to be leading in to Bobby being a ghost. Dean's already thinking it - Sammy just has his head up his practical butt and won't until it clobbers him over the head. I did get a kick out of them trying to get the info out of the professor
And again - where is the Impala??? Dean's lack of concern for his car makes me think this is all going to turn out to be an alternate reality.