The case about killer mannequins, more precisely a ghost inhabiting mannequins, is standard horror movie fare, but it’s still freaky as hell. No matter how many times you see a doll kill someone in movies, it’s still unsettling each time. Who doesn’t shy away from those empty, unmoving eyes? In its own way, Supernatural always puts a little extra on top, ending with a woman dying because she received a kidney from the now-deceased woman who is the ghost. A little more explanation would have been nice, but it was a good twist nonetheless.
The idea of an inanimate figure possessed by a ghost is a bit like Sam’s soul returning to his body. In a way, the body is a mere vessel, a hulk of mindless flesh like a doll, before it has a soul, which is the purpose the ghost has in the episode. Supernatural is again advancing the idea that body and soul, are completely different entities.
The rest of the episode is Dean figuring out to do with Lisa and Ben. After Ben tricks Dean into meeting Lisa, Dean faces reality, knowing he can’t stick around and make things right. As Dean rightly tells Ben, even if you love someone, circumstances don’t always allow you to be with them. I’m fairly certain this isn’t the last we’ve seen of them, though, so Dean may get another opportunity when the time is right.