Another change happened in this episode, where its hinted/revealed that Rita is hiding something. I always knew she was in on it, or had something to do with whats happening to Hopper, and we're soon gonna find out what it is. (Hopefully it'll be in the last 2 episodes).
We get a new character and its revealed that he was the one who helped out Damien - "Uncle" Nick. We learn that he knows whats going on and eventually works with Booth.....oh, forget this...
You know what, theres too much explaining to do for this show. You're better off watching the show in its entirety from the beginning.
I highly recommend it - even though its been cancelled. I hope they will bring this show back (like they did with Rome). This could rival 24 in the twists and conspiracy department.