Agent Afloat - S6-E2
Continuity mistake: During the investigation of the dead wife's crime scene, the arms of the corpse change position from shot to shot throughout the scene, including a moment where the corpse's arms are crossed, then in the next shot Ducky is shown crossing her arms. Ducky is also shown crossing the same arm twice, and the guitar control also changes direction and position with respect to the body. (00:03:20 - 00:05:30)
Agent Afloat - S6-E2
Continuity mistake: After Vance tells Gibbs to pack a bag because he'll be joining Tony in Cartagena, when it cuts to McGee he places his brown paper bag on the desk with the folded flap facing away from his keyboard, but next shot the bag faces the opposite way. (00:18:30)
Agent Afloat - S6-E2
Continuity mistake: After Abby confirms it's snot, the screen loads up a picture. However this image isn't on the screen a second later. (00:20:30)
Agent Afloat - S6-E2
Continuity mistake: On the carrier, Ziva and Tony are walking down a corridor. A crewman says "excuse me" and squeezes past, only to vanish instantly. (00:26:40)
Agent Afloat - S6-E2
Continuity mistake: Near the end, several of the items on Ziva's desk change orientation from one shot to the next.
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.