In the scenes toward the end when Red narrates the details of how Andy Dufresne escapes, he makes a miscalculation. He says something like, "Andy crawled 500 yards through **** smelling foulness and came out clean...That's the length of 5 football fields, just shy of half a mile." Well, a mile is 5,280 feet. 500 yards is equal to 1,500 feet. Half a mile would be 2,640 feet. 1,500 feet is considerably less than "just shy" of 2,640 feet. I wonder who did the figuring for that part of the script! Not Morgan Freeman for sure!