EW.com Michael Ausiello got an exclusive Q&A with True Blood creator Alan Ball!!!

Why wasn’t there more Eric in the finale?
BALL: There is a reason for not seeing Eric in the last part of the episode, but if I explain it, I’ll be [giving away] too much.

Why wasn’t Sookie susceptible to Maryann’s powers but Jason was? Do they have different parents?
BALL: They have the same parents. We will find out what Sookie is [next season]. There are such things as dominant and recessive genes. Maybe Jason is fundamentally human but he has a trace of some non-human stuff. He’s kind of a ridiculously perfect [human being]. He’s athletic and has that charisma thing, so maybe he had some help in that regard. [Laughs] Ultimately, if you look at percentages, he’s mostly human. Sookie has a stronger genetic predisposition in another direction. People who have read the books know exactly what I’m talking about. People who haven’t, it will be revealed.

You can check out the whole there HERE

PS – If you haven’t read the book, I highly recommend you try them out, there are 9 so far, all by Charlaine Harris!!!