Scenes featuring Colin Farrell doing full frontal nudity were removed/truncated from the movie as they were too distracting for test audiences.
Is an adaptation from Michael Cunningham's 1990 novel of the same name, which in turn was expanded from a short story entitled "White Angel", published in the New Yorker in 1988.
Around 50 minutes, Johnny walks next to a long (old) brick wall. This is Old St. Patrick's Cathedral on Mott Street in "Nolita" (just above "Little Italy") in Lower Manhattan. The graveyard is extremely old, and many films have been made here.