A huge component missing is any focus on when and how the murderer had the access and time. And the way the murders happen take a huge amount of time. There is no way they can look back and think who was missing at the time the murder occurred. It is just not part of this show. That is disappointing to me. The Mole covered this aspect.
Yes, I think it was dummy for the long shots and Adrianna was there only for the close ups. I do like how they have the victim talk during the credits. Nice touch.