Bran's vision also showed Cersei's wildfire explosion — four episodes before it happened.
This exact shot was shown during the wildfire explosion in the season finale, but if you looked closely, it was also featured in Bran's vision from episode six, "Blood of My Blood."
This sneaky foreshadowing gave some viewers an inkling of Cersei's devastating plot to come. We knew it couldn't be a flashback because the Mad King was never able to set off the caches of wildfire.