In the library of Wayne Manor Bruce Wayne sits in front of the painting "Oath of the Horatii" (Le Serment des Horaces), by Jacques-Louis David. The iconography of the painting is traditionally seen as about self sacrifice to a greater good, heroism, loyalty to family, and sorrow about impending doom or loss, all themes in keeping with the Batman mythos.
Mario D'Leon plays a Mooney Thug in this episode. Two years later he plays Leon, a bike gang member in Netflix's Daredevil season two.