Originally Posted by wolfboy
They could have discussed the concept in more detail in prior episodes as well. The guest right issue was prevalent as early as when Tyrion returned to Winterfell from the wall and as late as when Jaime Lannister was at Harenhall with Roose Bolton. Oh well.
True. But given that the guest right hadn't been made clear in the series, the Catelyn speech to Robb would have been an excellent way to introduce it more thoroughly to viewers.
Writers kinda dropped it there.