While filming on the train tracks, sound recordist Giacomo Waller was nearly hit by an oncoming train.
Though Nazi flags and banners were ordered online for the production of the film, none of the merchandise arrived on-time. As a result, Jason Vigdor, the production designer, created all of the Nazi paraphernalia by hand using store-bought fabric.
Gerstein's "cell" is really an old meat locker in an abandoned insane asylum next to Emory University.
The cell scenes were shot first using a wheelchair as a makeshift dolly. Because the tracking shots ended up looking too jerky, all of those scenes were later re-shot using a real dolly.