Factual error: In the scene where Micky and Howard are discussing Livia's parking ticket, Micky mentioned that date the ticket was issued was September 5th, a Thursday. The movie takes place in 2003 where September 5th was a Friday.
Factual error: When the Russian tears the toilet up to throw it at Frank, the room should be awash.
Answer: The song is "La donna é mobile" from the opera Rigoletto.