I agree with The Imp; and if Addy had given a reading that was no more than a reprise of one of his previous rôles (for instance the detective in The Thin Blue Line), he wouldn't have been considered for the part in AGoT.
Lastly, Jack Gleeson for Joffrey. Has no one else noticed that he looks like he is 8 years old? He looks more like a Bran or a Tommen than a Joffrey! At the beginning of the book when the royals come to visit Winterfell, Joffrey and Robb spar off in the training yard. How is this poor kid even going to lift a longsword? And Robb is supposed to look older and stand taller than Jon but the guy playing Jon already looks like he could accidentally kill Jack Gleeson with a pat on the back. I hope he looks a lot older now than he did in all those pictures.COME ON HBO!
After much debate, it was discovered that Gleeson is 16, maybe 17 by the time this starts filming. Interestingly they went for a short/small 16-year-old to play a 13-year-old rather than a tall 13-year-old who might be unrecognisable in a couple of seasons.
Actually, Eddard and Catelyn engage in marital relations just before Luwin brings them Lyssa's message. Both of them should appear topless in that scene... mayhaps bottomless as well. Mayhaps the ladies will see Sean's beans.
I wonder if we will see "flashbacks" of the Battle of the Trident or any of the past events that are referred to in the series (like the killing of Aerys by Jaime, etc.). Would make for awesome visuals and better explain the backstory.
I just hope he doesn't try to steal the Ring.