Visible crew/equipment: While Ellie and Nick are undercover they meet Donnie, and when Ellie walks behind the store's counter the yellow T-mark is visible on the floor. (00:16:30)
Rendezvous - S14-E24
Visible crew/equipment: When McGee and Torres enter Hudson's motor home, the green T-mark is visible on the floor just as McGee lifts the case lid. (00:12:35)
Visible crew/equipment: After Gibbs leaves McGee at the hospital, when it cuts to the bar with Palumbo at the pool table, there are multiple yellow and orange T-marks on the floor by the bar behind him. (00:27:15)
Visible crew/equipment: While Gibbs is in Forensics with Abby and McGee, they inform him about the data recovery from Commander Reza's car. When Abby tells Gibbs that someone hated technology more than him, Abby says, "Mind blown," and at the start of the next shot, the boom mic dips into view above Gibbs. (00:21:00)
Visible crew/equipment: While Gibbs is at the diner with Dr. Taft and his wife he gets a call from Ellie, and when it cuts to the overhead shot of Gibbs, Ellie, and Tony walking toward each other, on the ground we can see the reddish chalk mark (for Gibbs) and two white chalk T-marks (for Tony and Ellie) where the three actors meet. (00:26:10)
Visible crew/equipment: When "Nanook" stands beside his desk while he tells Tony and Ellie about Delilah's mother, there's a blue T-mark on the floor by McGee's feet. (00:03:05)
Visible crew/equipment: After Jimmy and Tony's chat, when Tony heads to the elevator Jimmy mutters that he hates being out of the loop. In the next overhead exterior shot of Tony's car, on the rear passenger window we can see the reflection of the boom operator walking and holding the boom pole/microphone. (00:21:30)
Visible crew/equipment: When Tony is with Captain O'Rourke in the parking lot, Borin approaches from behind. As O'Rourke turns to face Borin the actor's microphone has slipped out from under his shirt, between the buttons. Then when Borin says, "So will you," in the next shot facing O'Rourke and Tony, that mic is visible again. (00:38:10)
Crescent City: Part 1 - S11-E18
Visible crew/equipment: When Gibbs asks about the crime scene where Doyle was killed, just as LaSalle, Brody, and Gibbs head out the door, the white T-mark taped to the rug is visible near the door. (00:36:35)
Visible crew/equipment: In the first shot of Ziva and Tony at the pizzeria, just as Fiero tells them about sales during liberty week, the green tape mark is visible on the floor between Tony's feet. (00:10:40)
Visible crew/equipment: When Gibbs and Ziva enter Second Chances to question the owner about Curtis, in the overhead shot Gibbs stops beside the counter, and the red tape mark is visible on the floor between his feet. (00:18:20)
Kill Screen - S8-E16
Visible crew/equipment: When McGee and Blake Martin are in Interrogation, in the shot facing McGee just as Gibbs sits down, the reflection of the camera operator is visible in the mirror, on the right side of the screen. (00:33:30)
A Man Walks Into a Bar... - S8-E14
Visible crew/equipment: While Gibbs and Tony are in the galley interrogating the two members of the crew because they worked closely with Commander Reynolds, when Gibbs asks them if the gun looks familia, the boom mic dips into view at the top of the screen. (00:32:40)
Visible crew/equipment: When Gibbs tells Gail Walsh that they're keeping Jerry at NCIS, Gail replies, "Only on the condition that you keep me apprised of any new information," and in the next shot from behind Gail, a crew member (presumably the boom operator) wearing a black shirt and white pants is visible at the left side of the screen. (00:25:10)
Visible crew/equipment: During the exterior scenes in Arizona, with Sheriff Boyd, Gibbs, and Tony, in some shots either a hidden lavalier microphone or transmitter is visible. One example, when Dina fires her weapon Gibbs dismounts his horse, and his hidden transmitter is briefly seen at his back. Another example, while Dina tells Gibbs and Tony that her doctor ran blood tests, Sheriff Boyd's mic is visible under his shirt by the buttons, and so on. (00:35:30)
Visible crew/equipment: When Gibbs informs Dina Risi of Patterson's death, it then cuts to Dina as she tells them she mixes her own pigments, and in the next shot facing Dina, the wheel base of filming equipment is visible on the right side of the screen (non-existent in overhead long shots). (00:36:05)
Jack Knife - S7-E15
Visible crew/equipment: When Ziva and Damon walk to the back of the truck, the trailer doors are opened to reveal cases of watermelons, and just as Ziva says, "Melons," the red tape mark is visible on the ground between her feet. (00:25:20)
Visible crew/equipment: When Vance and Gibbs are in MTAC discussing the Damocles and Ziva, Vance decides on doing the good cop bad cop, and in the next shot the tape mark is visible on the floor, as Vance and Gibbs head out. (00:05:30)
Visible crew/equipment: When Ducky tells Gibbs the deceased doesn't have enough of a liver to determine time of death, as they walk past the door we see reflections of two people other than Ducky and Gibbs. (00:19:10)
Visible crew/equipment: While Gibbs and Ziva are interviewing the teacher in the classroom at Quantico, in the wide shot facing Ziva as she confirms the number of students, there are two red tape marks on the floor beside the two back legs of her chair. (00:05:20)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.