Doreen and Jack (Possible Spoilers)
I was wondering, could Doreen be actually Jack's daughter? I noticed a few hints in the movie that could lead to the idea that Jack and Richie's wife had an affair, and Carter tells the waiter (the guy he throws from a balcony, don't remember his name) "What would you do if it was your daughter?"... And the way Jack reacts after learning what happened to her is more what you would expect from a father rather than an uncle... Don't you think?
Remember the King!