Utilizing unused out-takes from this film with Kelly and O'Sullivan and shooting new footage with other actors, the producers created a sequel, "The Steel Cage."
Paul Kelly, who stars as the warden of San Quentin State Prison, had spent 25 months there during the 1920s, as a prisoner. He was convicted of manslaughter for the beating death of actor Ray Raymond, the first husband of actress Dorothy Mackaye, who was having an affair with Kelly and would later marry him. She was charged as an accomplice in Raymond's death for withholding evidence and was also imprisoned for 10 months.