The POW camp, Stalag Luft III, shown in part 7 was the same POW camp that 76 Allied prisoners escaped from on March 24-25 1944. One of the largest and most famous prison breaks ever. The movie, "The Great Escape", is based on this prison break.
Crosby never had an affair with Wingate, he had a brief affair with another woman named Dot whom he had known before the war. He confessed the affair to his wife and she forgave him.