Continuity mistake: Fornell gives Gibbs a juice box when Gibbs stays with Fornell. Gibbs puts the straw into the box with the straw closest to him. Camera changes and now the straw is at the other end of the box. Since there is only 1 hole for a straw on a juice box it is clear the box has turned around.
Continuity mistake: When Fornell and Gibbs are talking in Gibbs' basement, Gibbs places a red storage box on some wood and there is a fair gap between the red box and the cardboard box that is next to it. When the camera changes, the boxes are almost touching with no-one touching it.
Revealing mistake: When Tony is telling Gibbs & Ducky that Abby got a hit on the dead sailor's fingerprints, Gibbs takes the file from Tony; the camera shows the file, which appears to be a legitimate profile sheet, but in the comments section, is the script that Tony just read aloud.