I think most people haven't understood the point of why Bran talks to Sansa about her wedding night, instead of the more seemingly important things at hand (for example, the fact that Littlefinger was responsible for Ned's death)

I think that scene wasn't intended to just tell Sansa that Bran has seen everything. It was also a clever play by the makers of the show to portray that Bran isn't Bran Stark anymore, but he is the Three Eyed Raven. He has dissociated from the sentiments and emotions he used to have, and is now focused on one thing and one thing only - to save everyone from the White Walkers. In the grander scheme of things, he thinks that details like Littlefinger's role in Ned's death are insignificant. He tells Sansa about her wedding night so that she knows he is speaking the truth, and so she knows that he is not her little brother anymore.

Sorry if this has been talked about before. It's just been bothering me a lot.