Back in the first episode, titled Dragonstone, we saw The Hound have a vision in the flames, the former knight talking about “where The Wall meets the sea” and “the dead marching past”.
Since that opening episode, eagle eyed viewer have spotted something very interesting in the opening credits sequence; a minor change that could reveal a key plot point to come.
Eagle eyed fans noticed that, during the opening theme, The Wall looks a little different, the ocean by the most Eastern point seemingly being frozen.
Could the Night’s King actually be marching past, as The Hound predicted?