When Captain Jones is talking to Doiaru in his office, the clock behind Doiaru goes from 4:15 to 4:12 and back to 4:15 in the matter of a few seconds.
Through the entire movie, Captain Jones wears the insignia of a Staff Sergeant on his collar and Sergeant McLaren wears the insignia of a Private First Class on his collar.
When Doiaru's parents are driven away in 1944, the car bears a later kind of registration plate, only issued after 1966.