Continuity mistake: Gibbs holds up his father's WW2 era Hamilton watch and gives it to McGee. While McGee holds the watch to read the engraving on the caseback, the buckle strap is in McGee's right hand. In the closeup of the caseback the crown is at the bottom (which would mean the buckle strap is in McGee's left hand), but in the two shots facing McGee the crown is at the top (which would also make the engraving upside down while McGee reads it). (00:40:20)
Continuity mistake: When the helicopter lands on the helo deck there's a white aiming circle with a lineup line at the center, but after Gibbs and Palmer exit the helicopter the flight deck is again seen in a long shot, and the white lineup line is gone. (00:03:30)
Continuity mistake: After Marie's smoke alarm incident Marie starts to talk about Alex's dad coming to dinner, and when Alex walks away from the bouquet of flowers the ribbon has been removed from the bouquet, but next shot it's once again tied around the bouquet. (00:31:50)
Continuity mistake: When Gibbs and McGee are alone in the kitchen, in the closeups of McGee when he raises his left hand (such as when he takes the watch from Gibbs) he is not wearing a ring, but in the consecutive shots of the duo McGee is wearing a ring on his left hand (also odd, since it looks like McGee's wedding band). (00:39:10)
Chosen answer: "Policing your brass", means to pick up your expended shell casings, after firing your rifle, or pistol.
pross79