Spoilers contained in this review!
I really loved this episode! I love that Bobby is finally back, and I know some people don't get it, but I am pretty sure that when Bobby was being killed by Whitman, there was an energy transfer of sorts going on from Bobby to Whitman. What I figure happened is when Sam and Dean kill Whitman by burning his bones, the energy went in reverse, thus giving bobby more ghostly powers without the need to really learn them for as long as maybe some ghosts need to. What I really enjoyed about this episode was gaining a different perspective on ghosts and their nature in the Supernatural universe. I really can't say I look at them the same way anymore, it was very interesting to see things on their side! I get that the boys are having some trouble with this, but man this is the coolest way to bring Bobby back! I really love the potential for this to be a big help for the boys when facing Dick and the Leviathans! Can't wait for more!