So agree about Robb and Cat - I don't see the logic at all in having them not know about Bran and Rickon's supposed deaths. Apart from changing Robb from a tragic honour-before-reason figure and his father's son to a chump throwing away his oaths even while people warn him what a spectacularly bad idea it is, it must be confusing as hell to non-book readers: they don't know about Bolton's betrayal so they must be wondering why Winterfell's been sacked and why there aren't Northmen in the castle looking for the boys.