Factual error: Gibbs has a conversation with the father of the victim at the Tomb of the Unknown Soldier. Something that would not be allowed by the guards of the Tomb. (00:36:50)
Factual error: The ferry carrying Ziva and Tony to the aircraft carrier should have the Italian merchant flag, but it has the national one (this flag hasn't got the shield drawn in the middle).
Chosen answer: "Policing your brass", means to pick up your expended shell casings, after firing your rifle, or pistol.
pross79