In the Dark - S4-E22
Audio problem: When Abby is saying how she quit caffeine, the audio in the long shot doesn't match up with her mouth and is a clear overdub. (00:10:40)
Once a Hero - S4-E8
Audio problem: When the director is working out the letters on The Wall in the video feed her mouth doesn't move for the last L but her voice is heard. (00:38:20)
Witch Hunt - S4-E6
Audio problem: When Palmer says the line about Ducky chasing the youths, his mouth doesn't move for the words "three blocks". (00:05:00)
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