The blanket covering the stamped girl changes between shots.
Between shots, the time on Milo's father's pocket watch changes.
When German soldiers board the train car with the nurses, there are just stockings hanging on a line between cars. When a soldier comes back to close the door, a large white object is also hanging on the line.
At the beginning, the "German" tank shown during the anecdote about Janos' grandfather is a Soviet SU-152 "tank killer" of WWII vintage.
Although the film is set during WW2 during the winter of 1944-45, the official's railway car is a 1947 Tatra 15/52.