It actually shows GRRMs attention to detail. Most of Stannis' clothes would be Gold and Black. He isn't the kind of man to throw out all of his clothes when he created his own sigil, and being summer when he did, he wouldn't have bothered making new winter clothes with them. So it makes sense the only winter clothes he would own are gold and black.
I would actually love him to wear a fur robe with Baratheon colours ( as in gold and black) like he does in the books at the wall, just to remind that he is a Baratheon. I know he has his own sigil in the books but visually I think it is a good reminder that he is King Roberts brother, not cousin or distant relative etc.
Budget aside, they could have kept the anvil smash as long as Jon is basically knocked out by it. Then he gets saved by Ghost. It would show that in the scheme of things Jon is still basically a boy, and defeating a seasoned warrior twice his size is still beyond him. It would also sho how important and powerful Ghost actually is, and how important he is to Jon. Opportunity missed, but I'm not losing any sleep over it.