I've also been a fan of the books for years, and have been amazed at how closely HBO has followed the story. I can only pick out a few inconsistencies they threw in to speed up the story. The cast has been amazing, my only beef is they made King Robert more of an asshole than he was in the book. I liked him in the book.
If you're not a fan of reading, look for the audio book read by Roy Dotrice. One of the best readings ever, you will not be disappointed.
Sean Bean is awesome, thought this would fit in this thread
Sean Bean was stabbed in the arm following a spat over a Playboy model outside a bar in London. The row began when a passerby made some lewd comments about his date, named April Summers, a 22-year-old topless model who appeared in Italian Playboy. Witnesses said Bean followed the man and challenged him. Bean was then stabbed in the arm with what was believed to be broken glass, when he went outside for a cigarette later that night. Bean suffered a cut arm and a bruised face but did not want to go to hospital. He instead walked back into the bar and ordered another drink.
One: Phoebe Tonkin Two: Dianna Agron Three: Debby Ryan