See No Evil - S2-E1
Revealing mistake: Just as Gibbs and Tony head to Mtec, we see a close up of the webcam on the General's computer. Note the brand name. It's been flipped. (00:16:40)
See No Evil - S2-E1
Visible crew/equipment: While Sandy is helping NCIS by listening to the feed, Gibbs asks her if she can "remember anything else about the train sounds," and in the next shot we can see the reflection of the boom pole/mic (being held overhead) on the steel surface behind Abby. (00:34:05)
See No Evil - S2-E1
Revealing mistake: When the team speed into the lot at the end, tyre marks are visible on the ground from previous takes. (00:34:40)
Visible crew/equipment: At the very start as the camera pans over the sign saying base housing, the camera crew are reflected in the sign. (00:00:10)
Visible crew/equipment: While in the morgue, Ducky asks Palmer if his recorder is on, and in the next shot a crew member wearing an orange shirt is visible on the right side of the screen. A few shots later, as Ducky talks about cause of death, we see another crew member on the left side of the screen. (00:08:40)
Continuity mistake: Gibbs asks Abby what she has got for him. Abby lists all the stuff she has found and holds up the magazine with 2 hands. Camera cuts and now she is holding the magazine in one hand. (00:09:30)
Revealing mistake: As Tony and McGee drive off the numberplate is reversed. (00:14:40)
Continuity mistake: When Tony and McGee drive off the rear window is half open. The camera shows the car driving away and the rear window is closed. (00:14:40)
Continuity mistake: When Tony and McGee are driving in the car near the start, Tony has a dark shirt on. As the car drives off his arm outside the window has a light coloured top on. (00:14:40)
Continuity mistake: When Gibbs is leaning on the desk talking about the beetle, he has his legs apart. Camera cuts and they are crossed. (00:17:20)
Continuity mistake: When Tony is eating the nuts, he holds the container near the top. Camera cuts and he holds it near the middle. (00:22:30)
Visible crew/equipment: When Gibbs pulls the U-turn, there are markers visible on the road to indicate where to do the turn. (00:29:55)
Lt. Jane Doe - S2-E4
Continuity mistake: At the start, the drink DiNozzo has swaps hands instantly. (00:01:50)
Lt. Jane Doe - S2-E4
Visible crew/equipment: When looking round the apartment near the end, the camera crew are reflected in the TV. (00:35:50)
Lt. Jane Doe - S2-E4
Visible crew/equipment: While Gibbs is interrogating Cluxton they are alone in the room, and when he shows her Harlan Wilson's death certificate, in the overhead shot as she begins to snap, the leg of a crew member is visible on the right side of the screen. (00:42:05)
Lt. Jane Doe - S2-E4
Plot hole: It really doesn't make sense that they found the real killer from Jane Doe #1 assuming he also killed Jane Doe #2. They only found him because they assumed he was in prison for the last 10 years. One could explain that he must have gone to prison shortly after the first murder because he said he'd be back but wasn't, but that he was actually recently released is just pure coincidence. And without finding him they would never have suspected Officer Cluxton.
Continuity mistake: The amount of sandwich Tony has eaten when Abby is being hacked is constantly changing instantly. (00:13:00)
Continuity mistake: Just after Fornell is arrested, the agents are showing NCIS their surveillance of the mafia. When doing so, the headset on the one agent changes position instantly. (00:22:00)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.