Continuity mistake: The security guard at the start goes to grab his gun and keeps his hand on his holstered weapon. When Gibbs gives the OK, he now has a handheld metal detector in his hand. In the shot showing Gibbs we can see the guard and he doesn't move. (00:00:35)
Continuity mistake: When Gibbs is making the phone call to (presumably) the press, he is holding the receiver in his hand. Camera cuts and now his hands are on the desk. (00:31:50)
Continuity mistake: When McGee turns up at the house, Dinozzo puts his hand on McGee's shoulder. Camera cuts and it's no longer there. (00:26:30)
Continuity mistake: When Gibbs catches McGee playing games on the MTAC system, McGee's microphone is down by his mouth. Camera cuts and it's up out of the way, instantly. (00:18:30)
Continuity mistake: When Gibbs is walking away from the FBI agent at the start, he is approaching a tree. As the camera changes he is way past the tree. (00:04:50)
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)
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)
Continuity mistake: DiNozzo goes onto eBay to check the feedback of the dead officer. The feedback goes from a score of 1 with no star, to 87 with a blue star in the click of a button. (00:10:30)
Continuity mistake: When the woman is walking with Gibbs at the Naval base, she is doing her coat up in one shot, then has her hands in her pocket in the next. (00:08:15)
Continuity mistake: When talking to the warehouse manager, the manager has a clipboard with pink post it notes on. Watch closely and you will see the clipboard is constantly facing different directions as indicated by the pink post it notes. It some shots it's facing away from the manager, and in others it's facing the manager. (00:05:05)
Continuity mistake: When Kate is putting all the pieces together about Suzanne, she has her hand up. Camera cuts and her arms are crossed. (00:40:20)
Revealing mistake: Just after Agent Todd is seen going through the diary, there is a shot of the ship sailing past the camera. However the number 51 on the side of the ship is backwards, showing the shot is flipped. (00:30:20)
Yankee White - S1-E1
Continuity mistake: When the Sergeant collapses on the plane at the start he foams at the mouth. When the camera pans down the plane the foam has gone. (00:02:05)
In the Dark - S4-E22
Revealing mistake: When Tony is telling Gibbs & Ducky that Abby got a hit on the dead sailor's fingerprints, Gibbs takes the file from Tony; the camera shows the file, which appears to be a legitimate profile sheet, but in the comments section, is the script that Tony just read aloud. (00:07:36)
Continuity mistake: When Abby offers Palmer a sip of her Caf-POW!, after he helps determine how their victim was poisoned, the cup switches hands between shots. (00:26:20)
Continuity mistake: When Ducky and Palmer determine that LCPL Korby was frozen to death, Ducky's grip on his forceps changes between shots. (00:06:15)
Continuity mistake: When Vance shows Gibbs the access card belonging to their dead petty officer, the position of his hand on the card changes between shots. (00:38:35)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.