Once a Hero - S4-E8
Continuity mistake: When DiNozzo is resting at his desk, he has he feet crossed with his left foot on top of his right foot. When the shot changes his right foot is now on top. His hands have also gone from clenched to unclenched in the same shots. (00:20:25)
Once a Hero - S4-E8
Continuity mistake: The way Gibbs holds his ID out to the maintenance man changes between shots. In the first shot he has 2 fingers inside the ID in the second shot just his thumb is inside the ID. (00:07:40)
Witch Hunt - S4-E6
Visible crew/equipment: Just as Abby identifies the John Doe, from the angle behind her there is a crewman in a red shirt in shot over her right shoulder. (00:34:50)
Singled Out - S4-E3
Continuity mistake: When Ziva is pointing at the map and explaining about how the driver was tailed, she is pointing with her right arm. Camera cuts and now it's her left hand. (00:20:35)
Singled Out - S4-E3
Continuity mistake: When McGee spots the tyre marks of the unknown car, he is holding the markers in his left hand out to the side. Camera changes and now he is holding them two handed in front of his chest. (00:09:30)
Singled Out - S4-E3
Continuity mistake: When Tony is talking with Jenny about Gibbs, he has his hands clenched up by his chin in the over-the-shoulder shot and down in his lap in the front angle. (00:03:25)
Lt. Jane Doe - S2-E4
Continuity mistake: At the start, the drink DiNozzo has swaps hands instantly. (00:01:50)
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)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.