I think you caught this around the time most folks did. Maybe not really paying attention to the title sequence after the first time and then as the season went on you'd go "wait, that was a cool thing they showed. was that always there?" and it dawns on you that the locations change per ep cuz it's showing you where you'll be. Nice way to establish a world visually and geographically for the audience, honestly.The Game of Thrones intro features the locations of said episode. Figured it out later of the first season.