So this is what I saw from the flashblacks.
Jamie killing the mad king.
The King yelling burn them all. Presumably with wildfire.
We see the wildfire exploding, and since Jamie killed the King before he carried out his plans, I suppose this is showing a future event?
People are speculating the above picture being Ned Stark and his dying sister.
Ned yelling 'where is my sister.' At this point HBO is just teasing us since its pretty obvious what is going on.
Bran sees the Red Wedding, his mother and Rob dying.
Drogon flying over Kings Landing?
Bran sees Jon killing a Whitewalker.
The Whitewalkers turning a human baby into a whitewalker.