Factual error: When McGee tracks Mason's first phonecall, he says the line has been forwarded to a skype number. When he does the IP address shows up on the screen as 212.11.256.192. An IP never goes over 255. (00:11:40)
Continuity mistake: When we first see Mason he puts his hat on the table by his phone. His hat then disappears from the table only to be replaced by Mason when Gibbs walks in. (00:06:20)
Continuity mistake: When the grandfather is talking to Bibbs and gets the phone call his hands/arms are off the table. As the shot changes to a longer one, his arms are now on the table. (00:08:09)
Continuity mistake: When speaking to Conrad about taking the internship at NCIS, the clock behind Conrad changes drastically. (00:04:25)
Continuity mistake: The way Abby holds out the bells for the intern to wear changes depending on the shot. In one shot she has the string over all 4 fingers and in another only over 1. (00:09:20)
Continuity mistake: The writing on the board changes style at the very start. Note the 1st A in Satan. (00:00:15)
Visible crew/equipment: While Gibbs and Ziva are interviewing the teacher in the classroom at Quantico, in the wide shot facing Ziva as she confirms the number of students, there are two red tape marks on the floor beside the two back legs of her chair. (00:05:20)
Visible crew/equipment: When Gibbs tells the team to gear up because there's some kind of gas leak at Quantico, at the start of the first shot at the high school, the blue tape mark is visible on the floor between McGee's feet. (00:03:05)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.