most notably how they Tyrion Lannister get hit with a mallet before the battle even started, knocking him out and skipping the entire battle. In the book dude actually fought and even took out a guy or two. But I imagine having some braveheart type battles would be pretty expensive.
Anyways, I've caught up to the show with the book and it's pretty much the same. Not a whole lot happens in the book, lots and lots of conversation and isn't incredibly eventful so I see why the first several episodes of season 2 have been a bit slow. I'm sure that will change soon