Visible crew/equipment: When Tony drives into the hangar with Brian taped to the steering wheel, just as Ziva gets out of the car the reflections of numerous crew members are visible on the rear of the car. (00:39:50)
Revealing mistake: When DiNozzo is watching the ship through the binoculars at the beginning, the film is run in reverse. The sailor smoking on the deck is the giveaway, as the smoke he's blowing is going into his mouth. (00:00:15)
Visible crew/equipment: When Director Shepard apologizes to Tony during their phone conversation, Tony begins to cite a Gibbs rule, "Never apologize," and in the wide shot as Jenny finishes, "it's a sign of weakness," the camera is visible at the right side of the screen. (00:14:45)
Continuity mistake: We see Ziva take the photos out and place them on the interrogation table and ask the captain to point out their suspect. We then see the Captain pick up a photo. Camera changes to McGee and Tony behind the glass and we see Ziva getting the photos out and places them on the table again. (00:39:10)
Visible crew/equipment: When Mike tells Gibbs about the September 11 terrorist attacks, Gibbs needs to hurl the steak he just ate. Then just as Gibbs rushes toward the trash bin, in the shot from behind the bin, the camera and a crew member are visible on the right side of the screen. (00:30:05)
Continuity mistake: The year Gibbs joined NCIS is inconsistent. It is revealed in this episode that he joined the NIS in 1992, the same year it became NCIS. But in the JAG crossover episode "Ice Queen", Gibbs tells Commander Rabb that he has been an agent for 19 years, which suggests that Gibbs joined NIS in 1984. And in "Singled Out" in season 4, McGee mentions that Gibbs has been an agent for roughly 16 Years, which would put Gibbs' joining NIS in 1990.
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.