I dont know if anyone did speak about this before, but again with Robb´s storyline:
- First Robb was the one telling is mother to go find Renly and try to broke something with him.
- Next episode they try to make Robb look like he doesnt know what he is doing and he doesnt have a plan.
Hmmmm.....he does have a plan

Robb wants the North to be independent
In order to achieve that he is trying to get the Greyjoys on his side
He is willing to get some deal with Renly because I guess he spots Renly as the most likely to let him get away with is King in the North stuff....and i dare say that may be the best horse to bet on considering neither Jofrey or Stannis are keen on having one kingdom less.
So....what´s that whole deal about Robb NOW being a child and having no plan???
You see...they just made him all responsible and mastermind the previous episode when HE was the one responsible for sending his mother to Renly´s camp.
So...does Robb have a plan or not? Looks to me he has.......
Also, another thing that doesnt add up is:
It is not true that Robb can just go home and run away from Tywin. It´s not like they will let him run back home and stay there. Everything that we have seen previously and everything book readers know from future events clearly says that Robb is in a death match with Tywin and this will only end when one of them is dead. Tywin will not spare him even if he is no longer threatening the South, Tywin will try to get him anyway.
So, Robb´s portrayal in episode 4 really doesnt make sense considering everything that has been established thus far and everything that should happen if they want to follow the book