Child's Play - S7-E9
Continuity mistake: The way Ducky holds the Dog Tags at the start changes between shots. (00:04:24)
Child's Play - S7-E9
Continuity mistake: When we see the girl playing checkers, the position of the pieces on the board are constantly changing between shots without being touched. (00:29:28)
Child's Play - S7-E9
Continuity mistake: The piles of black pieces change from 2 columns to 3 without being touched. (00:29:55)
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