Factual error: The bird calls used in the film, such as the Cactus Wren, are from the USA, not Tunisia and Italy where the film is set.
Factual error: In the interrogation scene with Carravaggio, the German officer is addressed by the private Wehrmacht soldier as "Herr major". The officer is SS. By his shoulder patches he indeed has the equivalent rank of a major, but the correct SS rank is "Sturmbannführer". SS officers were never addressed as "Herr", but simply with the rank.
Factual error: Radial tires - bulging - and jeep-like tread in 1914 on the pickup aren't right. Most of 1914 tires were bias ply and very narrow, like 6 inches wide.