Visible crew/equipment: After Gibbs explains to Agent Reyes that Commander Shields in on Terminal Leave, and she has a four day deadline to solve the case, when Gibbs walks away there's an overhead shot and multiple chalk T-marks are visible on the ground. (00:05:00)
Visible crew/equipment: When Mr Palmer is analyzing the blood, we see Dr Mallard by the fridge. If you look closely you can see the boom pole reflected in the door. (00:06:00)
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