Continuity mistake: 5-4: Identity Crisis. When Ziva is speaking with McGee her lapel changes from being turned up and laying down.
Continuity mistake: When he hands Tony the autopsy report, Ducky has hair falling over his forehead, then combed back, then over his forehead again repeatedly from shot to shot. (00:07:15)
Continuity mistake: When Tony enters the NCIS interrogation room with Fornell, he sits down and places his bag of potato chips on the table. In the next shot, the bag has disappeared, he removes it from his jacket pocket, and places it on the table again. (00:25:15)
Continuity mistake: When Gibbs is trying to talk Lt. Arnett out of jumping off the ledge, Gibbs is relatively close to Arnett in the middle of The Wall when Ducky and Abby watch the live news report, but in real time, Gibbs is over at the far left corner of The Wall. (00:04:10 - 00:05:00)
Continuity mistake: When Gibbs is comparing McGee to the FBI agent's ID badge, Gibbs' left hand disappears from the bottom of the badge. (00:16:10)
Continuity mistake: After Ducky finds the needle in the MRI machine it cuts to Gibbs stepping on the bubble wrap, and as Abby happily rolls toward Gibbs, in the two shots facing her the headband magnifiers are flipped down over Abby's eyes, but in the shot facing Gibbs the magnifiers are flipped up over Abby's head. (00:27:30)
Continuity mistake: During season 4 when Ziva gets worried about Tony being 'sick', she is researching y. Pestis, and telling Gibbs how worried she is about Tony having tests and the long-term effects of plague. In season 5, first episode, when Ducky comes to tell the group that the body is not Tony because "he didn't have plague", Ziva looks confused and says "before my time?"
About Face - S5-E17
Continuity mistake: When McGee is walking up the steps to the body, he is holding his camera with his left hand in one shot and then the banister in the next. (00:03:15)
In the Zone - S5-E15
Continuity mistake: McGee is looking at a report at the end and we see the page he is looking at has a few lines of text. Nothing much. Camera cuts to a close up of the report and the page is completely different. (00:38:40)
In the Zone - S5-E15
Continuity mistake: At the end, Gibbs gives Ziva a file and she takes it in one hand. Camera does an instant cut and she now has the file open in her hands and a couple of pages in. (00:38:30)
In the Zone - S5-E15
Continuity mistake: When in the square Tony's ID goes from being caught up on his jacket to hanging neatly depending on the shot. (00:16:20)
Continuity mistake: Just as Vance says about Abby being smarter than Fornell gives her credit for, he is holding his toothpick. Camera cuts and he is no longer holding it. (00:22:15)
Continuity mistake: Ziva is tasked to go outside to the FBI car and she goes upstairs passing a wooden support. Camera cuts and she passes the support again. (00:20:35)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.