Goofs

The bombers that destroy the submarine are Lockheed Hudsons when they are approaching to make the attack, but when the attack commences they have changed to Douglas B-18 Bolos.

Canadian Airways floatplane CF-BJE is hijacked by the Nazis in Hudson's Bay. The plane crashes in a Manitoba lake hours later, showing the reg CF-A something.

The shots of the freighter sunk by the U-boat are clearly of two different vessels (The first and third shots are of a ship with a large, rounded stern, while the ship seen in the second shot--through the Germans' binoculars--has a sharp, shallow stern. The funnels and some deck equipment are also different).

When Johnnie first looks at the calendar, not once, but twice, it shows January 1940, but when it's shown in close-up, it's become July 1940, which is the correct time frame for this sequence. Most likely, the January 1940 calendar scenes, in which Laurence Olivier appears along with the calendar, were shot earlier, before the scene was rewritten to take place in July 1940, but by that time Olivier was no longer available for retakes.

When the seaman jumps the lieutenant while escaping near Banff he hits him and takes the rifle and then runs off. In the next scene when Scott and his hands follow him to the cave he inexplicably no longer has the rifle.

On the map of North America shown after the opening credits, the eastern boundary of North Dakota is inaccurately drawn, bulging out well into Minnesota, where in fact the border between the states is an almost straight, though slightly slanted, line.

U-Boat captains are not addressed as Kommandant! They are Kapitanleutnant (Captain Lieutenant) and simply addressed as Kapitan.

Even in mirror image H2 x G3 was incorrect. H would be the outside file and G the second outside file. The pawn capture was from the second outside file to the third outside file. The correct designation for the moves is B2 x C3, and G7 - G5.

When the u-boat is bombed it stays afloat for multiple consecutive catastrophic hits without listing or sinking. After the bomb strikes there are large numbers of items of debris flying in the air which appear to be wood. The u-boat would have taken on water from the first strike and sunk and there would be no debris floating in the air from a metal boat.

Johnnie The Trapper arrives at an outpost on Hudson Bay stating that he "travelled three weeks from Trois-Rivieres." That journey on foot would be difficult to do in three months. When the Hudson Bay post factor is radioing Winnipeg with a message for the trappers family in Trois Rivières he informs them that the trapper has arrived safely after a successful 11 months of hunting and trapping.

When the shipwrecked crew arrive and someone starts recording them, the second officer knocks the camera out of this man's hands and into the water. However, in this shot it is no longer a camera but merely a box, clearly because they didn't want to damage/lose an expensive camera.

The woman heard over the Factor's radio (the wife of the man he plays chess with via radio) speaks with a thick Brooklyn accent ("sub*moige*"), when in fact she lives in Grand Rapids, Michigan.

All of the Germans speak perfect British English, without even so much as a trace of a German accent.

When the film begins a freighter has just been sunk. But there is NO fire or smoke, or even oil in the water.

When the film begins a freighter has just been sunk. The Germans gather on the deck of the U-Boat and the Captain orders the motors stopped. But it is quite obvious that up until this order was given that the boat has actually been still, and that the boat has actually been a stationary stage (the water around the boat is calm and there is no wake behind the boat).

When the train is going over the railroad bridge at Niagara Falls ostensibly traveling from Canada to the U.S., it actually is heading from the U.S. into Canada. The water in the Niagara River under the bridge in the scene is coming toward the camera, with the train moving across the bridge from left to right. Canada would be on the right in the shot, the direction the so-called U.S. bound train is traveling.

After the U boat sinks the freighter in the Gulf of St. Lawrence they decide to run to Hudson's Bay to hide and get supplies. This is a voyage of 1,500 nautical miles and puts them way out of any shipping lanes. There are dozens of remote towns and villages in the Maritimes, Labrador and Newfoundland that would have fuel and supplies and be both remote and closer. It would have taken days for a U-boat with a maximum speed of under 20 knots per hour to go that distance during which they would have further consumed fuel and other resources.

When Nazi fires at Scott and his men, Scott says that he has got four shots left. But Scott knew that the Nazis stole both his revolver and his rifle. As the rifle was a1895 Winchester rifle, it would have carried 4 rounds in the magazine, and perhaps another round in the chamber. So he should have assumed that the Nazi still had his Winchester and therefore had at least another 4 rounds, 5 if he (Scott) had indeed placed a round in the chamber (which would have been a wise move for being in Grizzly country).