This episode was great, I think the best one yet.I love the culmination of all the ghosts returning to the house!
I did get upset about the doggie in the microwave, (as another member mentioned) but the dog was NOT killed. We were led to believe she was a new ghost after "seeing" her explode in the microwave and then hop up on the bed a few scenes later.
However, when Hayden was in the security guards car at the end of the episode, she said she didn't kill the dog, she put tomato's in the microwave as a joke to make it look like it was the dog exploding. Sick little ghostie, isn't she?