OK, I'm just seeing some more links as I watch the old episodes... I just watched "Home", and I felt a tingle when, just before the spirit of their mother saves them from the poltergeist in their house, she says, "I'm sorry" to Sam. I'm thinking this ties into how, in the season 2 finales, when she sees the demon in Sam's nursery, she recognizes him... Man, I can't wait to see how all these little things pan out in the big picture. So many hints have been dropped- it's awesome! And it just goes to show that Kripke obviously has had a complete storyline in his head the whole time; he's not just making it up season to season. Very COOL!