In the scene where the German soldiers besiege the Polish post office near the end of the film, a German soldier is seen firing an MG42 machine gun from his shoulder. The weapon itself was not in use by the German army before 1942, while the scene in the film takes place in 1939. Additionally, the weapon is not supposed to be fired standing as depicted, and the film shows the wrong sound and firing cadence for the weapon.
While depicting the picnic scene on top of the bunker roof, in the background are clearly visible remains of the Mulberry harbor, Arromanches, France. This artificial harbor was set up days after the D-Day landing, yet the scene plays way before it.
When Agnes eats eels, a brown bottle is not visible in one cut, even though other nearby objects on the table can be seen. In the same series of cuts, the position of her empty glass and Alfred's beer glass also change.