1. So how did Cassie have Dean's number? In Phantom Traveler, we learn that Dean only had his current number for six months. Given how estranged they were, I have a hard time believing he contacted Cassie with his new number. So how was she able to contact him?
2. I feel like Hell House had the beginning of some interesting ideas about the reliability of eye witnesses and the power of rumors, and how the internet affects rumors. But it doesn't really go anywhere. Instead there is a lot of making fun of Ed and Harry. Which, well, given how your average SPN fan is probably more like them than then like Sam and Dean - it makes the mockery kinda obnoxious.
3. I've said this before, but I will say it again: adult Sam was nearly killed by the shtriga. How on earth was kid Dean supposed to hold it off?