Continuity mistake: When Malachi is sneaking around the Damocles for the first time, he is walking and above him is a grated walkway, which changes to a normal ceiling instantly and the grated walkway vanishes. (00:18:15)
Continuity mistake: When Vance talks about Ziva's loyalties, his fingers are resting on the table. When we see the live feed on the screen they are not. (00:06:30)
Continuity mistake: When McGee goes to answer Gibbs' phone, there are 2 female extras walking up the steps behind Tony that simply vanish into thin air. (00:22:10)
Continuity mistake: When we see Gibbs and Vance in MTAC waiting for the connection, Gibbs has his hands on his folder in his lap. Camera changes and now he is holding the sides of his folder. (00:04:10)
Continuity mistake: At the start we see the two fishermen have gloves on. However when they grab the net to try and get the bag down, there is a hand holding the net that doesn't have gloves. (00:00:45)
Continuity mistake: On the Damaclease, we see one of the crew confront Ziva's associate and pin him to The Wall with a gun trained on him. Camera changes to a close up and the arm holding the associate to The Wall has disappeared. (00:18:25)
Continuity mistake: When the remains drop onto the shrimp boat, the position of the boats differs between shots. (00:01:00)
Continuity mistake: The way Ziva holds the sailor's Dog Tags changes between shots. (00:21:25)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.