Other mistake: When the German soldiers are on the radio alerting other German units of Americans in a captured German tank, they are using the English word "tank"- the Germans should be using the word "panzer", instead.
Other mistake: When Saunders' tank and the other tank are sparring against each other, closeup shots of the tanks' rear drive sprockets show them moving in reverse, but overhead shots of the vehicles show the tanks moving forward.
The Steeple - S3-E21
Other mistake: The Squad descend from The Steeple via the bell pull rope but the bell does not ring. (00:42:15)