Corrected entry: The episode deals with the murder of a Navy admiral and the cab driver transporting him through Rock Creek Park in Washington, DC. Late in the episode, the investigators try to get a lead on another cab driver by tapping into the records from taxi meters. The problem is, DC cabs don't yet have meters. Congress banned them in 1933, but legislation passed this year now gives the DC government authority to install meters. And in fact, just days before this episode aired in Nov 2007, DC's mayor announced plans to switch from the zone system to meters by April 2008.
Corrected entry: If the ship is that top secret that the Navy commander had to get permission from his superiors to brief the director of NCIS on the ship, its mission, and what it might be carrying, there is NO WAY, NO HOW that the United States Navy would allow an Israeli Mossad agent on board that ship.
Correction: Well, considering the fact that Ziva is an NCIS agent, they probably overlooked the fact that she is Mossad and let her on. (Or the commander might not have known that she was Mossad.).
Correction: Could have been a Maryland or Virginia cab if the ride originated out of DC.