Mac says, "I'll come back for you!" twice, once to Danny Devito. This is an obvious reference to Romancing The Stone in which Danny Devito starred in and his brother in the movie yelled the same line to him.
Frank says that the Schuylkill river is the dumping ground of all of Philadelphia's unsolved murders. Rob Mchelleny said he once found a dead body near the Schuylkill river once when he was trying to drink with his friends as a teenager. They alerted a cop who said that the dead body was just "clothes"
The "red brick building" Frank identifies on the ferry is an AT&T Corporate building built in 1972.