The relationship between Rob Stark and Greyjoy Jr. is a little bit more full of tension than in the books. Supposedly, they were like brothers, but of the same age. That's okay, but so far Theon is too unlikable, when I think you're really supposed to sympathize with him for quite a bit.
Also, the problem with Rob and Sansa being too old is really showing through as they are acting like children... whereas in the books they
are pretty much children, growing into adults still. Sansa's character is also getting short shrift because there are no interior monologues, and she is probably the most subtle character to follow, as far as "good intentions gone bad" goes. She's moody and teenage bitchy, and more than a bit of a slow learner, but she's not downright unlikable in the books. I'll keep whining about this until they fix it
The scene between Joffre and Sansa I don't remember from the books, but it was an odd addition. Joffre is painful to look at, but they did okay.
Khal Drogo has been really disappointing, but I for the first time liked Harry Lloyd as Viserys in this episode, and Daenerys is slowly getting better. The real stand-out on that side is Mormont, who was really cast well. Still, it's still a little Kiping-esque in its approach to strange cultures, if you know what I mean.
The Aerie has been a little disappointing, it's not as high up or as steep as I had expected. Lysa is downright freaky, as is her son, but wasn't she supposed to be puffy in the books, not skinny as a rail?
Also, a minor pet complaint: Syrio Forel looks like a douche. Sorry. But not as bad as Jon Snow.