First is the Nordic mythology resemblance and references. There's bound to be more, I haven't done very much or gone very far yet
but the first and most obvious reference is the name of the character "Hod".Next is things that make me think 'Song of Ice and Fire'. For one, Draugrs. They're [censored] white walkers, man! Undead, glowing blue eyes....awesomeness!!! And also Riverwood. I have trouble with that name, I always read it as Riverrun

That's all I can think of for the moment...
What about everyone else, what have you seen that is either a reference to something or just makes you think of other things?
EDIT: Perhaps should be in spoilers forum...sorry, didn't quite think that one through.

