Continuity mistake: After Ajax's death, when Agamemnon shouts, "Forward!" as they charge, Agamemnon's two horses have very distinctive white markings on their faces. Then when Agamemnon and Odysseus (on the same chariot) retreat, after the cheering of Trojan royalty, in the close-up as Odysseus shouts, "Back to the ships!" the white markings are entirely different, and now both horses are actually wearing blinkers on their bridles to cover their eyes.
Picture added by Super Grover