The poem Howie recites in the car is "Out of the Cradle Endlessly Rocking" by Walt Whitman.
Marty and Howie address is 20, Randolph Drive and their phone number is 631-405-0377. (in the scene where Gary breaks in).
The distributor, Lot 47, appealed against the NC-17 rating at the same time as launching a publicity campaign about how arbitrary the rating system was. Both failed.
Brian Cox took the part of Big John Harrigan against the advice of most of his colleagues and his agent.