Factual error: After Toorop and the women arrive in Canada, they stay at a motel in Kitimat. The caption on the screen says it's 10 miles from the American border. In fact, Kitimat is more than 370 kms from the American border. There are a number of towns closer than that. The caption also has the latitude for Kitimat three degrees further south than what it really is, which would make it even further from the American border.
Factual error: Although the movie was set in the 1940s, the railroad track had modern concrete ties.
Factual error: When Cam ambushes Ba'al in 1939, he has two Thompson M1 submachine guns. The M1 version of the Thompson wasn't developed until 1942.
Factual error: The Volkswagen Campervan that is used at the beginning of the film has a Zürich number plate, yet the cantonal coat of arms to the right of the number plate is that of the canton of Ticino (red and blue stripe). This is incorrect: The coat of arms should have been a white-blue stripe, which is the coat of arms of Zürich Canton and would correspond correctly to the number plate.
Factual error: The "corn" they are growing is not corn, just crabgrass.
Factual error: As the cars travel over 1950s Westminster bridge, the modern red route lines can be seen on the road.
Factual error: Ben stops at a rest area near Hope, BC. He is headed for Vancouver and Vancouver Island. Leaving the rest area, he turns right, as he should, to head for Vancouver. The highway sign points left for Hope, BC, and right for Vancouver. I've been at this rest area, and the direction he turns toward Vancouver is correct. However, the next shot shows him going through Hell's Gate tunnel, which is north of Hope. He would have had to turn left, go through Hope, and 40 or so miles north to go through the Hell's Gate tunnel. The next scene shows him on the ferry to Vancouver Island, which was in the direction he was headed when he turned right from the rest area. There would be no reason for him to turn around and go through the tunnel, as he was already heading in the right direction.
Factual error: One of the women in the group picks up a piece of calcite (Iceland Spar variety). It is obviously calcite because of the very obvious rhombohedral cleavage and other visual indicators. The sample is later identified as ringwoodite. Ringwoodite is cubic with no reported cleavage. Even if it did exhibit cleavage, it would not be rhombodedral.