Continuity mistake: The year Gibbs joined NCIS is inconsistent. It is revealed in this episode that he joined the NIS in 1992, the same year it became NCIS. But in the JAG crossover episode "Ice Queen", Gibbs tells Commander Rabb that he has been an agent for 19 years, which suggests that Gibbs joined NIS in 1984. And in "Singled Out" in season 4, McGee mentions that Gibbs has been an agent for roughly 16 Years, which would put Gibbs' joining NIS in 1990.
Continuity mistake: "Patriot Down": The beach scene in the opening sequence is repeated at the end, but the dialogue differs the second time. Gibbs is kneeling on the sand when someone puts a gun to his head and says, "Welcome to Mexico." When Gibbs reaches for his weapon, the voice growls, "Don't even think about it." These two lines are delivered in reverse order when the scene replays at the end.
Continuity mistake: When Abby is first discussing the victim's blood types, there is a shot from behind her that shows a black band wrapped around her upper left thigh about an inch below the hem of her skirt. The shot changes to a front view and the black band is gone.
Continuity mistake: In the scene where Gibbs' phone breaks, and he tells McGee to "reboot" it, Tony is in the back, getting a phone out of the cabinet. He starts to give the phone to McGee. The next shot, the cabinet opens again, and Tony pulls out the phone again and gives it to McGee. (00:04:55)
Continuity mistake: In the scene where Chip first brings the evidence to Abby (after getting it from Mr. Palmer), in one shot, her spiderweb tattoo is on the right side of her neck, and Chip is standing to her right. In the next shot, her tattoo is on the left side of her neck, as it normally is, and Chip is standing to her left. (00:08:20)