This effect caught my eye in the video. Right at 6:00 you see a doorframe which you can see an empty space behind, but looking through the door you see a 3D room. How did they do THAT!?
http://www.youtube.com/watch?v=LhHxy83XIdw
It's a great simulation of how it looks in the movie too.
http://www.youtube.com/watch?v=LhHxy83XIdw
It's a great simulation of how it looks in the movie too.