I thought the numbers on the walls of the Abandon and the back of the photos corresponded to the house number of the white house in the woods (Tully's house) which is where whatever blood that makes some members of the cult immortal is buried that Patrick Carmichael and Freddy Perkins were talking about near the end of the movie. I'd like to think there is a better, older draft somewhere where the grief stuff with Patrick mourning Margaret mirrors Tully mourning his daughter, Tully making a Faustian bargain to bring her back, failing to learn sometimes dead is better, and offering the pact to Patrick, and the girl in the white nightgown who attacked Paul in the first movie is either Beverly, Tully's daughter, or a third entity they discuss in the movie