When Salvatore was talking about Egyptians in World Trade Center getting caught because of a serial number in axle of a truck he was referring to the 1993 World Trade Center bombing which was done with a truck full of explosives in the parking garage. Conspirators were later caught because of a serial number located in remains of the blown up truck.
The song played over the ending credits is "I Saved the World Today", by Eurythmics.
Second time a Metallica song is featured on the show. "King Nothing" was featured as background music in "From Where to Eternity" (#2.9).