Up in Smoke - S9-E23
Continuity mistake: When Dr Ryan holds out her hand for the file from Gibbs at his house, the hand she holds out switches between shots. (00:17:40)
Visible crew/equipment: Gibbs walks into Abby's lab while she's resting under the desk, and when Gibbs helps Abby stand up the bouncing shadow of the boom mic/pole is visible at the top, right side of the screen. (00:26:20)
Visible crew/equipment: When Ziva and Tony arrive at the crime scene, a visible marker is on the floor exactly where McGee comes to stand. (00:03:50)
You Better Watch Out - S10-E10
Other mistake: McGee's text to Tony says "Dell's body found. Rock Creek Park." The suspect they are looking for and body found is named Justin Cannady. (00:22:23)
Revealing mistake: When Gibbs' flip phone started ringing, and he flipped it open to answer it, for the brief second, in the closeup shot of the flip phone, the screen on the phone says "No Service" despite receiving an incoming call.
Continuity mistake: When DiNozzo has got the victims watch on, it's on over his white glove. When the shot changes it's now over his bare skin and not the glove. (00:10:20)
Other mistake: When EJ gets spooked near the end and turns to face a wall with a doorway to "North Stairway C", she faces the camera with her torch facing the camera directly. However behind her is a perfect shadow on The Wall of herself. This shouldn't be possible as the only source of light, as shown, is from her torch. Cade and Levin are in a different room so couldn't be their torches. (00:39:20)
Visible crew/equipment: After Tony says the line "What would Steve McQueen do?" we get an extreme closeup of the front bumper of a car with Virginia plates on it. Just to the screen right of the plate, you can see the reflection of some of the filming rig used for the shot. (00:31:50)
Out of the Frying Pan - S8-E18
Continuity mistake: The way the axe faces when Leon leans it against The Wall changes between shots. Sometimes it's facing left, others it's facing right. (00:28:00)
Visible crew/equipment: When reading the background of the victim, a blue tape marker is visible under McGee's desk. (00:06:50)
Visible crew/equipment: As the team are just leaving the office for the crime scene, as Tony walks away from his desk, a yellow tape marker is visible on the floor. (00:03:40)
Visible crew/equipment: When Ziva and Gibbs are searching the changing rooms, the camera crew are reflected in The Wall mirrors. (00:12:50)
Continuity mistake: When we see young Gibbs sanding the birdhouse, the way he's holding the bird house changes between shots. It goes from being upright to on it's side. (00:35:30)
Continuity mistake: When Gibbs is looking at the photo of the Dog Tags in his basement, the way he holds the photo changes between shots. (00:19:20)
Continuity mistake: The bottle of Pepto Bismol that Fornell places on the counter at the start simply vanishes from the shot. (00:04:05)
Chosen answer: It is never stated, however she must have been there several years if she is on presidential detail.