James Haven plays a character who wears his lovers blood around his neck. Haven's real-life sister Angelina Jolie famously wore the blood of her then-husband Billy Bob Thornton in an ampule around her neck.
This episode has the first direct mention of the 9/11 attacks. Before, the attacks were merely alluded to with mentions of Homeland Security, etc., or other departments/events that happened as a result of the attacks.