Continuity mistake: When Gibbs shows Cpl Yost the tape in the interview room, he is burning a match down to his fingers. Camera shows a closeup of the head of the match being extinguished, but it is just the head that is alight. It is not burnt to his fingers. It also goes from horizontal to vertical. (00:36:50)
Continuity mistake: When DiNozzo is woken up, the cover falls off his shoulder. Camera cuts and it's back on. (00:24:25)
Continuity mistake: The security guard at the start goes to grab his gun and keeps his hand on his holstered weapon. When Gibbs gives the OK, he now has a handheld metal detector in his hand. In the shot showing Gibbs we can see the guard and he doesn't move. (00:00:35)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.