Factual error: The Mitanni king and his son are depicted as black Africans. The Mitanni originated in the modern Iran/Iraq area, or possibly as far east as India, but certainly nowhere near Africa. They were definitely not black Africans.
Continuity mistake: Tutankhamun and Suhad ride to the Mitanni city on a horse with no equipment at all, not even a saddle. Yet mysteriously when they need to stop for the night a large tent appears out of nowhere.