The house in Hartwell, Georgia has the light switches with smaller rocker switches and square covers. Both are typical British design rather than American toggle switch and rectangle cover. Many homes in the United States prior to 1990s are fitted with doorknobs rather than door handles. The American version is at the waist level while British is higher and between waist and shoulder levels.
The vehicles in Hartwell, Georgia have ECE headlamps and taillamps. Cadillac Eldorado and Deville have amber turn signal indicators in the taillamps, which American version don't have. A yellow British numberplate is partially covered by the state of Georgia numberplate on Cadillac Eldorado.
During the conversation with the translator and Anton, Anton claims to be haunted by the sound of the gas being released in the concentration camps. The gassing in the concentration camps was achieved by dropping chemical pellets into an acid that would then aerosolize the chemical. There would be no sound of gas hissing.