The subway station scene was filmed in the then-closed Court Street IND station. It was taken out service in 1946 and since 1976 is the home of the NYC Transit Museum.
The character Varkas, portrayed by J. Edward Bromberg, says he is not in good shape and that he has a condition, patting himself near his heart. The year after this film was released, Bromberg himself would suffer a fatal heart attack just a few weeks shy of his 48th birthday.
Once thought to be a lost movie, it was restored in 2019 by Nicolas Winding Refn's company, byNWR, from the discovered only known print held at the British Film Institute.
Shot "guerrilla style" on location in New York City as the producers did not pay for any filming or other permits. The police were paid to look the other way, and these amounts were entered as "schmear money" in the film's budget ledger.