I admit, I like this episode less for the main story-line (a bit creepy for my tastes) than for the character work for Sarah and Dana. While the cat fights between the two characters are great...it's still very rewarding to see them develop a camaraderie--and maybe even something of a friendship.
(Bruce's reference to shooting Reagan in the beginning was an...interesting touch.... Still, I like the acknowledgement that the night in "Destiny" was a mistake "that changed everything.")
A nice awkward moment at the police station, when Walt stumbles over Sarah going with Dana...and Sarah just responds with a tired Look....
(By the way...Sarah's line about "finding lost keys" seems to be a reference to the book....)
Also, Rev. Purdy has a great character moment--his disgust at his adviser talking about the financial benefits of the profits....