During the Tower of Joy flashback in season 6, Bran seems surprised when he sees Ned Stark struggling against Ser Arthur Dayne while clearly he will not be in the books, if and when he learns about it.
So why did the show make this change? Was this to give Bran a few lines, rather than him being a silent spectator to the fight? Or is it just making a small change, assuming that Ned never told him about the fight and Bran probably heard a semi-true version from the others?
It could also mean that Game of Thrones is implying that Ned lied about it to Bran, increasing the shock value of the reveal and making Ned somewhat less honorable. We really hope that is not the case but it doesn’t really make a lot of sense to change this bit of information from the books. It is true that Ned never talked about what happened inside the tower of joy but to assume that he let that rumor fly around is so uncharacteristic of him. That would have been disrespectful to Ser Arthur Dayne and we don’t think Ned would have allowed that.