When McGee and Gibbs are in MTAC on a call with Colonel Collier, the caption on the screen has her location spelled incorrectly as "Camp Lejuene." It should be "Camp Lejeune."
There is no "Earl of Trent" listed in the British Peerage, and no Drummond listed as a suspect for "Jack the Ripper." For obvious legal reasons, the show did not use the title of a real peer. A fictional name was used to hide the Jack the Ripper joke.
When they are displaying DiNozzo's results from TrackMyDNA.com in Abby's lab, you can see that it says "Neanderthal Quotent" rather than the correct "Neanderthal Quotient" .
McGee gets a call from Ellie. On his cell phone there's a picture of Ellie in her undercover Marine Corps uniform. But the caller ID says Eleanor Bishop, whereas the last name they went by was Donan.
Abby says she put Tony's email on the plasma TV in her lab, however when Tony touches the screen, the color becomes distorted, meaning it's actually an LCD.