As the fantasy series ushers in a darker chapter, House of the Dragon season 3 has a new opening credits sequence, but fans have spotted a mistake in the tapestry.
Towards the end of the opening credits (around the 1 min 31 seconds mark on YouTube), the tapestry includes a four-legged, three-headed black dragon against a red background. This is the Targaryen sigil, which is mentioned in Game of Thrones author George R.R. Martin's books and in the main show. However, in Martin's works, the dragon on the sigil has two legs, not four, which Martin has brought up before.