When Bramble walks/runs into the town his shadow is behind him, then in front, then again behind him.
In different shots, the pepper and salt shakers on the table in front of Rommel change positions, inexplicably, as he taunts his captives with his plan.
The Iron Cross around Rommel's neck is far too big to be authentic.
The famous German MP-40 machine guns being used in the film are converted American made Thompson machine guns. The German soldiers guarding Romme'ls room are holding them in an unconventional way to further hide the fact.
When John Bramble is introduced to the Germans as Paul Davos, a calendar is behind him on the wall. It is a 1942 calendar but shows Saturday, July 4th in red as a holiday...which of course is not a holiday in Egypt.
The maps used by the Germans are English maps, not German, though why not in German? Egypt in German is Agypten (umlaut A), not five letters.
Rommel is consistently depicted as disdainful of Sebastiano, and the Italians in general. In fact Rommel appreciated the aid of the Italians, and consistently encouraged their commanders, such as his counterpart Field Marshal Count Ugo Cavallero, to perform at their best effort.
Rommel did not disguise as an archeologist before the war, and he did not hide supply dumps on the desert.
John Bramble puts on the shoes of Paul Davos one of which has a much thicker sole because Davos has one leg shorter than the other to give him an even gait. But Bramble walks around with a limp that the real Paul Davos never had while wearing the shoes.