Visible crew/equipment: When Gibbs and Ziva are in the "safehouse" Ziva set up for Ari, a crew member and his boom microphone are seen on the left of the screen, right before Gibbs climbs the ladder to remove the hidden camera spying on them. (00:30:10)
Silver War - S3-E4
Visible crew/equipment: When in Ducky and Jimmy are in autopsy alone, there is a cameraman in the reflection of the body cooler wall. (00:18:15)
Visible crew/equipment: In the scene where Tony approaches the Mallard residence by car for the first time, there is a stage light, complete with filter(?) on the balcony. (00:13:50)
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: While Gibbs is with Abby in the lab when she mentions her dissection of the laptop, in the overhead shot as Abby says, "since it came in here, Gibbs," the moving wheel of the camera dolly is visible at the bottom, right corner of the screen. (00:09:35)
Visible crew/equipment: While Ducky starts to tell Jimmy about an English earl, when Gibbs walks into Autopsy, the reflection of crew members are visible on the steel door's surface. (00:08:35)
Visible crew/equipment: When the "militia" guy fires the MP5 at the mannequin, after the last closeup of that mannequin it then cuts to a long shot facing the militia members, Gibbs, and Stone, and two crew members (one in shorts and the other wearing jeans) are visible at the top right side of the screen. (00:38:15)
Visible crew/equipment: When Tony tries to buy the sword for $500 the saleswoman walks away, and as he agrees to $600 in a following shot, the blue T-mark is visible on the floor. (00:23:10)
Visible crew/equipment: When they arrive at the funeral, a crew member is seen in Gibbs' car's paintwork. (00:35:30)
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 Abby is going through the garbage to disprove Tim's sister you can see a crew member's foot in the screen- it's a brown boot.
Marine Down - S1-E9
Visible crew/equipment: In the final scene, the camera, crew and light panels are briefly captured reflected in the door of the silver sports car when Gibbs gets in. (00:43:00)
Visible crew/equipment: In one of the first episodes (2nd or 3rd) of Season 1, in an interrogation room scene, the camera pans around the table, and a crew member is visible in the far wall mirror, standing beside the camera in front of Gibbs.
Visible crew/equipment: Gibbs walks into Abby's lab while she's resting under the desk, and when Gibbs helps Abby stand up the bouncing shadow of the boom mic/pole is visible at the top, right side of the screen. (00:26:20)
Visible crew/equipment: When Ziva and Tony arrive at the crime scene, a visible marker is on the floor exactly where McGee comes to stand. (00:03:50)
Visible crew/equipment: After Tony says the line "What would Steve McQueen do?" we get an extreme closeup of the front bumper of a car with Virginia plates on it. Just to the screen right of the plate, you can see the reflection of some of the filming rig used for the shot. (00:31:50)
Visible crew/equipment: When reading the background of the victim, a blue tape marker is visible under McGee's desk. (00:06:50)
Visible crew/equipment: As the team are just leaving the office for the crime scene, as Tony walks away from his desk, a yellow tape marker is visible on the floor. (00:03:40)
Visible crew/equipment: When Ziva and Gibbs are searching the changing rooms, the camera crew are reflected in The Wall mirrors. (00:12:50)
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.