Douglas Kelley authored the book "22 Cells in Nuremberg", which recounts his personal interactions with participants in the Nuremberg trials. In the book’s final chapter he describes recognising patterns from pre‑Second World War Germany in the modern‑day United States. Following the trials, Kelley collaborated with the Berkeley and Oakland police forces in California, interviewing officers to evaluate their psychological profiles and frequently drawing comparisons with those he had interviewed at Nuremberg. Much of his research is held in the UC Berkeley libraries.
Russell Crowe and Michael Shannon had earlier appeared together in Man of Steel: Eroul (2013).
The cast boasts two Academy Award winners — Rami Malek and Russell Crowe — alongside two Academy Award nominees: Michael Shannon and Richard E. Grant.
Russell Crowe, Michael Shannon, Richard E. Grant and John Slattery have all appeared in comic-book films: Crowe and Shannon portrayed Jor-El and General Zod in the DCEU respectively, Grant featured in the X‑Men film franchise with Logan (2017), and Slattery took on the role of Howard Stark in the MCU. Crowe has also shown up in the MCU as Zeus in Thor: Iubire și Tunete (2022), and in Sony’s SSU as Nikolai Kravinoff in Kraven vânătorul (2024).
