Hi. I was watching the xmas 2011 clip and I've noticed that when Vader and Luke are fighting on the gantry, just before Vader cuts Luke's hand, his saber hits the railing but there are no sign of the cut through it, and I wonder if Ady will be correcting this.
In this video you can see what I'm talking about.
http://www.youtube.com/watch?v=3x6CTK8KqXk&feature=youtu.be