While waiting to ambush the General's car another vehicle is heard approaching. Elias listens, the pronounces that it is a "Volkswagen". While Volkswagen GmbH was technically in existence at the time, the vehicle in question wouldn't have been called a Volkswagen - it was known as a 'Kubelwagen'(bucket-car), while the better-known Beetle was a 'KDF-wagen'
The fully illuminated side of the moon always points toward the sun and hence at night it must be closer to the horizon than the other side, but when we first see the moon at night the illuminated side is higher.
(Possibly deliberate mistake by the filmmakers) Among the possessions returned to General Kreipe at the end of the film is his Ritterkreutz, lost very early during the kidnapping. In reality, as far as we know, the decoration has remained lost for ever.