Continuity mistake: In the final scene, Gibbs is working on his boat wearing safety glasses and has a pencil behind his right ear under the frame. When he learns Sergei has survived his pulls his glasses off in disbelief and the pencil is no longer behind his ear. After a cut away to the director and back to Gibbs again, the pencil has returned and remains there for the rest of the scene, including the black and white closing transition.
Continuity mistake: When the Russian agent is talking to the bad guy, the Russian agent's coat collar changes position in just about every shot.
Continuity mistake: When Gibbs meets with Tom Morrow at the dinner, Tom asks Gibbs if he is going to upgrade to a smart phone. Gibbs opens his phone, the shot changes and his phone is now closed. (00:15:15)
Chosen answer: "Policing your brass", means to pick up your expended shell casings, after firing your rifle, or pistol.
pross79