Did it seem to you like his accent was off a lil bit from previous episodes?
Yeah definitely. Could be because he wasn't in the past season much or this season at all so far. Or could be a conscious choice to show that he drops his act when he's out of King's Landing.
I was a bit put off by their interaction, really. I think there should have been at least a moment of him being the brave rescuer before it becomes clear that he's actually creepily into Sansa. But in the show they had him all over her from the moment she stepped onto his rape-barge.