Visible crew/equipment: While Gibbs is with Abby in the lab when she mentions her dissection of the laptop, in the overhead shot as Abby says, "since it came in here, Gibbs," the moving wheel of the camera dolly is visible at the bottom, right corner of the screen. (00:09:35)
Crescent City: Part 1 - S11-E18
Visible crew/equipment: When Gibbs asks about the crime scene where Doyle was killed, just as LaSalle, Brody, and Gibbs head out the door, the white T-mark taped to the rug is visible near the door. (00:36:35)
Continuity mistake: When Tony is sitting at McGee's desk talking to Delilah, Tony's holding the phone to his left ear with his left hand, but in the overhead shot Tony's holding the phone to his right ear with his right hand. (00:15:50)
Continuity mistake: When Emma is talking to Abby at the end her hair is either blowing In the Wind or hanging freely depending on the shot. (00:40:15)
Anonymous Was a Woman - S11-E4
Continuity mistake: In the scene when Tony and Gibbs are riding together and Tony is eating a sandwich, it starts about half gone, the angle changes and there is only a bite gone, the angle changes again and it is about half gone again.
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.