
Witch Hunt - S4-E6
Continuity mistake: McGee is taking some photos of 3 bullet casings on some wood flooring. Take note of the casing to the upper right. Its position changes with no-one touching it. (00:06:20)

Continuity mistake: When Tony is going through the drawer there is nothing red in the overhead shot. However in the close up there is a red folder in the drawer. (00:06:20)

Singled Out - S4-E3
Continuity mistake: Tony places the blue folder in Jenny's tray on her desk neatly. When he goes to leave it is now propped up on one side of the tray. (00:04:25)

Continuity mistake: Fornell gives Gibbs a juice box when Gibbs stays with Fornell. Gibbs puts the straw into the box with the straw closest to him. Camera changes and now the straw is at the other end of the box. Since there is only 1 hole for a straw on a juice box it is clear the box has turned around. (00:25:35)

Continuity mistake: When Fornell and Gibbs are talking in Gibbs' basement, Gibbs places a red storage box on some wood and there is a fair gap between the red box and the cardboard box that is next to it. When the camera changes, the boxes are almost touching with no-one touching it. (00:04:15)

Untouchable - S3-E20
Continuity mistake: When Gibbs is talking to the Lieutenant about her rights, his has his papers next to a green folder. Camera changes and the papers have vanished. (00:17:10)

Untouchable - S3-E20
Continuity mistake: When Gibbs is interviewing the LT, he has a green folder on the table. Camera changes and now there is white papers on top of the folder. (00:16:45)

Untouchable - S3-E20
Continuity mistake: McGee brings the food back to NCIS and there are 3 bags on the tray. Two are taken leaving one. We then see Tony take one leaving a fourth on the tray that wasn't there before. (00:14:35)
Chosen answer: "Policing your brass", means to pick up your expended shell casings, after firing your rifle, or pistol.
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