Visible crew/equipment: As the tow truck pulls the victims car away, the film crew are reflected in the paintwork. (00:06:40)
Continuity mistake: When Kate is putting all the pieces together about Suzanne, she has her hand up. Camera cuts and her arms are crossed. (00:40:20)
Marine Down - S1-E9
Visible crew/equipment: Just after Gibbs has fired at the car speeding away, a camera pops into shot on the screen right. (00:25:00)
Marine Down - S1-E9
Visible crew/equipment: When the team meets the Colnol for the "off the record chat" they walk past a black 4x4 that reflects the camera following them. (00:07:35)
Continuity mistake: When Abbi asks Gibbs to smell the shirt, the way she holds the shirt changes instantly. (00:04:05)
Revealing mistake: When the team run from the Captain's office at sunset, Gibbs closes the door as the last man out. However, a shadow can still be seen to move over the door. We know there is no-one else in the office. (00:38:05)
Revealing mistake: Just after Agent Todd is seen going through the diary, there is a shot of the ship sailing past the camera. However the number 51 on the side of the ship is backwards, showing the shot is flipped. (00:30:20)
Continuity mistake: When Ducky is pointing at the hairline fracture on the x-ray, he stops pointing. Camera changes angle and he is pointing again. (00:11:20)
Continuity mistake: When interviewing the girl at the crime scene, the blood splatter on her face keeps changes instantly. (00:03:30)
Yankee White - S1-E1
Continuity mistake: When the Sergeant collapses on the plane at the start he foams at the mouth. When the camera pans down the plane the foam has gone. (00:02:05)
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.
Bete Noire - S1-E16
Character mistake: Ari tells Ducky and Gerald that if they lie or he suspects them of lying, he will shoot them in a ball-and-socket joint. Ari later shoots Gerald in the shoulder and mentions that next time it would be his knee. The knee is not a ball-and-socket joint. It is a hinge joint. The only other ball-and-socket joint in the human body is located in the hip. Ari is an educated Doctor and should know the difference. (00:24:00)
Murder 2.0 - S6-E6
Revealing mistake: When the NCIS team were directed to the first video, McGee states that they were the first to view the video, however, the view counter on the video said 531,817 views. (00:06:40 - 00:07:15)
Factual error: There is a flashback scene in this episode, where a young, dejected Abby Sciuto is walking along railroad tracks after failing to give the bear back to Ricki. This scene starts with a shot of the railroad tracks, then pans up to Abby. It can be seen that the rails are laid on concrete sleepers, with modern steel clips holding the rails to the sleepers. Given that the flashback appears to take place when she was at least a couple of decades younger (i.e. the mid-1990s), such modern methods of construction wouldn't have been used. A period-accurate railroad track would have wooden sleepers, spikes and lighter rail. As such, it's obvious that the producers just went to the nearest railroad tracks and filmed the scene there.
Up in Smoke - S9-E23
Continuity mistake: When we see Gibbs and Dr. Ryan at Gibbs' house he places two mugs on the table. The mugs' positions change between shots. (00:16:10)
Anonymous Was a Woman - S11-E4
Continuity mistake: In the scene when Tony and Gibbs are riding together and Tony is eating a sandwich, it starts about half gone, the angle changes and there is only a bite gone, the angle changes again and it is about half gone again.
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.