Question: During Rex Harrison's entire performance as Julius Caesar his arms and legs are covered by garments underneath his military garb and robes, even while in Egypt. The other Romans as would be expected have bare legs and arms. Was Harrison suffering from some skin condition or was he too shy or embarrassed of his limbs to show them in the film?
Question: How come Hilts could not answer the German at the end of the movie when he said he could speak German to Colonel von Luger?
Answer: He could have only known a small amount of German, enough to answer a question or two, but not enough to carry on a full conversation. Also, the German seemed to be wanting to have a full conversation with him. He was on the run and didn't have time to talk. He was most likely being a smart ass saying he knew German.
Answer: .And, just to add to the previous answer: even if he could speak conversational German, he would likely do so with a very strong American accent (as he does when he speaks the few words to the Commandant earlier), so the guard would have picked up on that right away, anyway.
Answer: The people of higher rank would usually have more or better armor so in his case that would probably be extra armor for his legs and arms.