About 15 minutes into the movie when Mature is being questioned by the Germans he is shown to extend his hands to show that his fingernails had been removed as an apparent torture method. The scenes leading up to this, while he is talking to his captures, shows that his nails are complete.
The German Captain Ritter takes Sgt. David Thatcher to a POW camp run by the Italians. At the camp are several trucks purporting to belong to the Italian army. They are British Bedford 3 ton 4 x 4 GS QLs with right hand drive and were only used by British forces in the desert of North Africa during WWII. There is also a British Austin K2 Ambulance present at the POW camp.
German soldiers using British No4 Lee Enfield rifles (even if they were using captured British rifles they would have been Short Magazine Lee Enfields, not Number 4s.)
When the escaped prisoners attack the two German tanks, one uses a machine gun taken from a half track. As he attacks the Germans, the sound of the machine gun firing is clearly heard. However, the weapon lacks an ammunition belt and is therefore not loaded. Further, there is no muzzle flash when it is supposed to be firing.