Continuity mistake: When Prince Aegon tells King Viserys that everyone knows that his grandsons are bastards, he's looking straight at him but in the next shot he isn't.
Trivia: Prior to this series going into production, HBO greenlit a series called "Bloodmoon." It was set in the Age of Heroes, around 5,000 years before the events of Game of Thrones, and starred Naomi Watts in the lead role. The project was shelved after the pilot was shot.