Visible crew/equipment: When the voice activated 4x4 is driving back, you can see the camera's shadow reflected onto the tyre in the close ups of it. (00:00:40)
Visible crew/equipment: At the start of the sexual harassment class, when Tracy Taylor explains, "A coworker shows you a cartoon or photo of a sexual nature," we can see three orange T-marks taped to the floor near her. (00:02:55)
Visible crew/equipment: When Gibbs is discussing Lt. Seabrook with Dr. Pike, just as Gibbs says, "Gonna need your security tapes and access logs that you keep, Doctor," the cameraman's reflection can be seen moving on the glass surface. (00:10:25)
Continuity mistake: When the mannequin is hit at the start, we see a close up of it in the shade and one arm is down by its side. When the 4x4 drives off the mannequin has both hands up in the air. (00:00:50)
Visible crew/equipment: As the 4x4 drives off after hitting the mannequin, you can see the film crew reflected on a boom lift in the 4x4's windscreen. (00:01:05)
Continuity mistake: When the mannequin is hit it's on the double yellow lines with another mannequin stood on the lines behind the first one. When the 4x4 drives off, the second mannequin has moved on its own from the double yellow line to the side with the other 2 upright male mannequins. (00:00:45)
Continuity mistake: When the mannequin is hit, it moves from in the shade to in the sunlight without being touched. (00:00:50)
Continuity mistake: At the start, Otto hits the mannequin straight forward. Camera changes and now the mannequin is to the side of the 4x4. After the mannequin is hit, the woman looks out of her side window to look at it. However when we see the 4x4 drive off the mannequin is now on the opposite side. (00:00:50)
Continuity mistake: When Jimmy is flexing his arm for Duckey, he is flexing his left. Camera changes and now he is flexing his right. (00:13:30)
Answer: I hadn't seen the backdoor pilots yet but while it wasn't explicitly stated, at least onscreen, I heard somewhere Vivian got either fired from NCIS due to jeopardizing a case, got resigned from the agency, or transferred to the FBI.
Raykvega423