Mac tells Adam that Taxi Driver is one of his favorite movies. It actually is one of Gary Sinise's top three favorites. The others are the first two Godfather films.
At the end of the ep, Aubrey invites Mac to the new pizza place in her neighborhood, Metrano's Cafe. Apparently it's pretty good, because it's still in business two years later; it's one of the locations the kidnappers in episode 8.13, "Brooklyn Til I Die," demand that their ransom money be left.
