When Tony checks the eBay username IGOTTOOMANY, a small numeral
(1) shows on the screen next to that name, meaning that the user's rating is 1. However, a few frames later, the (supposedly) same user has a rating of 87, with 100% positive feedback.
At the end of the episode, Gibbs receives a call from On-Star notifying him of the location of a vehicle. The vehicle in question is a Jeep Cherokee, which as a non-GM product would not have On-Star.
Kate is seen reviewing a file stamped 'CLASSIFIED'. Classified documents are properly marked with the classification level of 'CONFIDENTIAL', 'SECRET' or 'TOP SECRET'.
When the sheriff tells Gibbs of a second murder, she declares they are dealing with a serial killer. Typically, law enforcement doesn't say it's a serial killer until there are three deaths.
While there is a Grayson County in Virginia, it's in the far southwestern part of the commonwealth. Oceana Naval Air Station is in Virginia Beach, on the East Coast, and about a 5 hour drive away from Grayson County.
All of the aircraft on the flight line are stationed at a California base, (flaps on the front landing gear list a California base) yet the investigation takes place on a Virginia naval air base.