Factual error: Air Force One landed in Wichita, Kansas. The local coroner claimed Jurisdiction for Wichita County. The city of Wichita, Kansas is in Sedgwick County, in southern Kansas. Wichita County, Kansas is in western Kansas, about 250 miles from the city of Wichita. (00:05:40)
Factual error: There is a big deal made about Gibbs giving Shepard one of his magazines in the study with La Granoille. It is implied that that magazine was used in the gun to kill La Granoille on his yacht. The magazine he gave her was for his department issued Sig Sauer P228, however, he was killed with a Glock 19. The magazines are not compatible.
Factual error: While the NCIS crew are working a crime scene, Ducky starts yet another parable about his past experiences, referring to the dating of an Indian skeleton by the caliber of the bullet, "a 40-75". He states that since he knew the year that the US Army used that caliber, he could accurately date the remains. Unfortunately for Ducky, the US Army never used a 40-75. It did, however authorize a contract for a 45-70 cartridge in 1873. (00:09:20)
Factual error: Special Agent Gibbs asks McGee how long Medical School takes in the UK, to which he answers 4 years. This is incorrect, because almost all aspiring doctors in the UK go through the Undergraduate Medicine route (MBBCh) which takes 5 years. When McGee performs a search on the computer, he enters "Medical Post Graduate" in the search criteria, which would be unlikely in real life. (00:24:27)
Factual error: The inspector is suffering from thallium poisoning. However, everyone is using various radiation detection methods to detect the thallium. Natural thallium is not radioactive. Of the artificial thallium, the only with a half-life long enough to last long enough to pose a problem is too weakly radioactive to be a significant hazard.
Factual error: While investigating a Marine's murder, the team uncovers a labyrinth of live-streaming spy cameras hidden in the rooms of a Virginia motel. They show an attic in a motel room with cameras in multiple vents, the problem is that there are no air duct tubes which those cameras should have been mounted in. With no duct work you have no heat or no A/C, all you get is dust.