Factual error: After Gerald gets back to NCIS HQ, he notes that he wasn't able to drive Ducky's Morgan; a stick. Abby brags about knowing how to drive a stick since she was ten. When asked what she drove that had stick, she answered, "Red '47 Ford half-ton with four on the floor and Bubba riding shotgun." When asked who Bubba was, she answered that he was the best coon dog in Jefferson Parish. If in fact Abby grew up in the city of New Orleans, as stated by McGee in the episode before, the dog would not have been the best coon dog in Jefferson Parish but Orleans Parish. No part of New Orleans is inside the Parish of Jefferson. If it was truly the best coon dog in Jefferson Parish then Abby would have lived in Metarie or Kenner, Louisiana, both of which are inside the parish limits of Jefferson Parish.

Silver War - S3-E4
Continuity mistake: When Abby realises she is like a Barbie doll, her hands are together by her chest. Camera cuts and one hand has moved away instantly. (00:24:00)

Continuity mistake: Gibbs puts his gun in his drawer on a blue folder then goes to talk to Fornell in the lift. When he comes back, he picks his gun up and the contents of the drawer and position of the gun have completely changed. (00:14:50 - 00:16:50)
Character mistake: Ducky states that the Romans believed that the vein of 4th finger on the left hand ran directly to the heart, thus, logically, it was the "ring" finger. However, there is no evidence that the belief originated with the Romans, nor that the 4th finger has a special vein...the fingers in the hand have a similar vein structure.

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)
Other mistake: When Ziva signs the will, she signs it with her real name - "Cote" is visible.
Suggested correction: No. We see in the closeup Ziva David writing her name, and the shot cuts away just as she starts to write the last "d" in David (timecode 00:28:00).
Other mistake: It's the same license plate (107TIX) on Runyon's truck when the video footage is enhanced by Abby as the Ford sedan in S2 E10 "Chained" when Dinnozo and Jeffery leave the cabin.

Continuity mistake: When Gibbs visits Abbie's lab to ask about the smoke detector and computer, he finds the CPU disassembled on her table. The "hard drive" is placed on a white tray in front of the cover, which has been removed from the CPU. Initially, the hard drive is white in color. However, in the close-up shot, it turns black and looks like a different piece altogether. Furthermore, the white tray disappears, and the hard drive sits on the CPU cover. In the wide-shot, the white tray reappears, and the hard drive is again white as it was originally. (00:24:50)
Silver War - S3-E4
Continuity mistake: When inside the Smithsonian, Tony is fooling around with a bear. The baseball hats on all 3 agents have black trim on the brim, then white trim, then black trim. Zeva says her hat has a 9mm hole, and pokes a finger through a hat with a black trim. Gibbs says it is for ventilation. Then she drives home, the hats have white trim, and hers has no hole.
Factual error: In the scene on the plane when Tony is going to inject the Epi-Pen, it shows him placing it against her thigh and pushing the trigger. In actuality, an Epi-pen is automatic and he actually pushed the end that the needle comes out of.
Continuity mistake: When Tony tells Ziva he won't help her track down the remaining 'Smiths', a woman in the background is walking down the stairs; as Tony stands up, she takes two steps down from the lower landing. When the camera shot changes on Tony, she's back on the landing. (00:25:15)
Visible crew/equipment: As Gibbs, Ziva and Tony enter the Nelson home with guns drawn; just after Ziva enters, a man can be seen reflected in the door's window (Gibbs and Tony are in frame, and there is no other character there). Tony enters, then Gibbs - and we see the cameraman reflected also. (00:19:45)
Other mistake: When McGee tells Gibbs that Nelson erased his entire hard drive, the camera shows the diagnostic he is running - "Primary Drive Erased: 100%." Yet the details below show 93GB used of 111GB total, and the drive letter is G: (not C: as it would most likely be.) It could be argued that his C: drive is simply an OS drive, and G: is his data drive, but still, 93GB used is not 'erased'. (00:22:05)

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)
Visible crew/equipment: Just near the end, as Ducky faces the other M.E. in Autopsy with his guilt, the camera shows a person reflected in the silver wall (who would be standing beside Ducky). It's not Ducky, as the M.E. is looking at and talking to Ducky with a different angle. The person appears to be dressed in medical scrubs, but the M.E. and Ducky are the only two in the room. (00:40:45)
Audio problem: When Moore's widow sees her lover being brought in, she shouts "Roger!" - but her lips don't move. (00:33:05)
Power Down - S7-E8
Continuity mistake: When the team finds the abandoned car from the robbery, and Tony notices the blood trail, he is initially kneeling down, then standing up. He then kneels down a second time, and then is instantly standing up again. (00:21:25)
Deliverance - S6-E15
Factual error: It is constantly mentioned that the number found at the crime scene is Gibbs' military service number. The Marine Corps stopped using service numbers on Jan. 1, 1972 and since has only used Social Security numbers for identification.

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)