McGee reports to Gibbs that Harper Dearing has no criminal record. However, in a future episode, it comes to light he has some DUI convictions.
"The explosion created a vacuum and it sucked out all the oxygen and extinguished the fire," Abby explains. Burning thermite cannot be extinguished by oxygen deprivation because the oxygen is contained in the thermite mix itself (in the form of iron oxide). Thermite can therefore even be ignited under water and under sand.
The Taxi that Tony and Ziva are using to go to the harbor of Naples, is a Russian Lada 1200/1300 or VAZ-2101 (you can see the Lade sign on the front grille). This car is a license production of the Italian Fiat 124, which would more likely to be found in Italy than it's Russian counterpart.
The car plate of the taxi in Naples (Italy) have two letters+four numbers+two letters. In Italy there are different kind of plates ( two letters+five or six numbers or two letters+three numbers+two letters ) but not this combination (two letters+four numbers+two letters).
Another mistake is the writing on the taxi door: " Comune De Napoli " ( in Italian is " Comune Di Napoli " ).
There is no current aircraft carrier called the Benjamin Franklin (and there was not one when this aired). There was a ballistic missile submarine by that name (SSBN 640) that was decommissioned in 1993, and an Essex-class aircraft carrier by that name...that fought in WWII and was decommissioned in 1947.
At about :15 the mailman shows up with mail and wearing his hat backwards. The front strap is in the backside.