The Truth Is Out There - S1-E17
Revealing mistake: Gibbs finds a bunch of cash hidden in the victim's speaker. "For Motion Picture Use Only" is printed on them.
Character mistake: When Gibbs shows Major Dorden his badge, his ID card is upside down. (00:06:00)
Yankee White - S1-E1
Continuity mistake: Agent Todd is standing there coat open, hands in her pockets on Air Force One watching Gibbs walk away when the bad guy who is a reporter (Leonard) comes up to her and comments "Loosening your dress code Kate". Seconds later when she turns to indicate that he should return to the press section her coat is now buttoned up. (00:33:50)
The Truth Is Out There - S1-E17
Continuity mistake: When Gibbs shows Darin Spotnitz the photo of Petty Officer Gordon and asks if he recognizes him, Gibbs' hand jumps from the top of the photograph to the side. (00:05:45)
Continuity mistake: Tony boards a helicopter to go to Puerto Rico. When he lands, it's a different one. The first has the number 406 on its side.
The Truth Is Out There - S1-E17
Continuity mistake: When walking down the alley at the start their position is constantly changing forward and back. Note the new cement patch. (00:02:00)
Marine Down - S1-E9
Continuity mistake: After speaking with the colonel about the incident, we see an aerial shot of the colonel and a marine walking off, leaving the 3 NCIS agents on their own with no-one behind them. As the agents start walking a marine appears behind them. (00:09:00)
Marine Down - S1-E9
Continuity mistake: When Gibbs tapes Kate's palm pilot to the target it hangs vertically. Camera changes and now it is hanging horizontally. (00:03:15)
Continuity mistake: When DiNozzo rings Gibbs, we can see Kate taking metal scrapings on a pole that has tape on it just above her hands. When we get a closeup of Kate, the tape is not there. (00:25:50)
Continuity mistake: When the lady at the base exchange is throwing stuff at Tony, Tony has a yellow shirt in his hands that disappears, only to be thrown again. (00:24:00)
Continuity mistake: At the end the little boy tells Gibbs the password he has chosen for his tree house. As he does, Gibbs is working on the railing at the opposite end to the ladder. Gibbs says it's a good password and to come up. However he is now at the end of the railing by the ladder. (00:39:50)
Continuity mistake: At the very end we see Gibbs working on the treehouse. As the little boy climbs the ladder, Gibbs is working on a railing. Camera changes and now he is stepped back from the railing. (00:42:00)
Continuity mistake: When DiNozzo is reading the ingredients of the brass stripper, he has 2 hands on the tin in one shot and just 1 hand in the next. (00:29:00)
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)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.