Corrected entry: When the sub first docks at Pearl Harbor, a mountain range is visible in the background. Pearl Harbor lies adjacent to a completely flat volcanic plain, and there are no mountains anywhere in its vicinity. (00:16:30)
Corrected entry: When Duke is talking to the sailor from Alabama, Junior, he is informed that Junior's great-grandfather served on the Merrimac. No Southerner would ever have referred to the CSS Virginia as the "Merrimac".
Correction: According to the official CSS Virginia website, some southern sources did refer to it as the Merrimac\Merrimack. BTW, according to them, the proper spelling is Merrimack, after the Merrimack river. http://cssvirginia.org/.
Correction: Pearl is located with the Waianae Mountains (4,000+ feet) less than 9 miles to the West and the 3,000+ foot high Koolau Mountains to the East. All are highly visible from anywhere in Pearl Harbor.