The weapons held by the Camp guards include, not only the MP40 SMG and the Mauser Kar 98K as they would have been issued, but also the American Thompson SMG, also known as the "Tommygun".

The model shown in multiple episodes on at least half the guards and other military personnel is furthermore a Thompson model from the early 1920's, and not even the one issued to US and allied troops during the WWII conflict.

Why the production crew would allow such an obvious error to occur is beyond me. It is absolutely sure that they were aware that the Thompson was an American weapon, and not used by Germans at any time.

An unsubstantiated weapons-blooper is also that some of the bolt-action rifles used on the show would appear to be Enfield's rather than Mausers. I shall get back to this if it can be proven from the footage.