Continuity mistake: When Gibbs and his father drive up to Winslow's house, in the shot facing Jackson he holds out the bottle of Kentucky bourbon with his left hand, but in the next shot facing Gibbs it's held out in Jackson's right hand, then it's back in his left hand. (00:18:45)
Continuity mistake: At the end, when Jackson holds out the key to the Dodge Challenger, in the closeup the key case has its snap closure face up with the key facing Gibbs, but next shot the key case is upside down with the key facing Jackson. (00:40:25)
Continuity mistake: During the conversation between Jackson and Ziva, a $20 bill is dropped, face down. When Ziva bends down to pick it up, the bill is now face up.
Continuity mistake: Episode "Heartland": In the first five minutes of the show, after the guys are beaten up in the alley, when the black guy is laid down on the ground there is a blood stain on The Wall, behind where he was standing. When the other guys go to the white guy's aid the blood stain is gone, for about 3-4 shots. When the NCIS team is there gathering evidence the blood is back on The Wall.
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.