Factual error: During the slow motion sequence in DC, landmarks from Los Angeles are in the background. (00:11:45)
Continuity mistake: McGee, Gibbs and Ziva all agree it is Saturday morning. However when the director looks at her phone, it says it's Thursday. (00:06:40)
Audio problem: When McGee is saying that he was raised a gentleman, his mouth doesn't move. (00:04:30)
Continuity mistake: This episode takes place on the same day as the previous episode, however, Jenny's hair is now much longer. (00:02:35)
Continuity mistake: When the mule asks for a cast he is told after surgery. At this point he raises his hand above his head. Camera cuts and it's back by his side. (00:06:30)
Continuity mistake: When Jen is asking who's been in her study she points with her hand holding the letters at the end. Camera cuts and now she is holding the letters by the middle. (00:03:40)
In the Dark - S4-E22
Continuity mistake: Don explains what the investigation is about, and while doing so he has his hands clasped together. Camera changes and they are spread apart. (00:13:20)
In the Dark - S4-E22
Continuity mistake: Don gets a folder out of the bottom draw of his desk, camera changes and he's closing the top drawer. (00:13:15)
In the Dark - S4-E22
Visible crew/equipment: When Don explains how he was about to call NCIS, he leans over to get a folder out. When he does, the camera shadow can be seen moving along the back of his head. (00:13:50)
In the Dark - S4-E22
Audio problem: When Abby is saying how she quit caffeine, the audio in the long shot doesn't match up with her mouth and is a clear overdub. (00:10:40)
In the Dark - S4-E22
Continuity mistake: When Ducky finds agent Lee's bra, he has some sticky labels in his hand in one shot and not in the next. (00:08:15)
Visible crew/equipment: When the car pulls away from the airport at the start the crew are reflected in the paintwork. (00:00:40)
Continuity mistake: When Jenny hands the Russian a cigarette the packet goes from green to red. (00:39:50)
In the Dark - S4-E22
Character mistake: On the message board visible in the background when the team is discussing Wong, the word "Artillery" is misspelled "Artillary". (00:18:20)
Continuity mistake: When Abby chucks the polystyrene in the box, its position changes between shots. (00:18:10)
Cover Story - S4-E20
Continuity mistake: We see Abby's phone lit up and ringing. Camera cuts and now it's no longer illuminated but still ringing. (00:37:00)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.