Continuity mistake: The pill bottle the agents recovered from the house has the Doctor's name "Fleming" to search for. But when McGee searches the NCIS system, he spells the name "Flemming" and gets his results. As well, the scrip sheets for Dr. Flemming archived on the computer, contain several identification numbers - DEA (AJ0000000000), Batch (00000001) & License (C00000.) - not real numbers - so the prop master didn't even try to fake any of them. (00:15:20)
Continuity mistake: When the shrink asks if DiNozzo and McGee are a couple, their positions change instantly. (00:18:40)
Continuity mistake: When Jenny thanks Nikki for coming in so quickly, Nikki has her coat over her hands, camera changes and now her hands are uncovered. (00:22:00)
Continuity mistake: When DiNozzo mimics sneezing on Nikki she reacts and freezes. Camera changes and her entire position has changed. (00:26:15)
Revealing mistake: In a close up of the iPod there is 1 song on the play list, playing at the 29 second mark. However, the icon to indicate that the iPod is on repeat is missing. Therefore, the iPod has only been playing for 29 seconds, despite the fact the crew left a good time before the team arrived. (00:07:20)
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