Factual error: During the airport scene, the 737 shown is a model from 1984 or newer, with distinctive large diameter engines. The movie is set in 1976, when all 737s had long narrow engines.
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: When Natalie decides to rebuild the carburetor that Keith gave to her, she opens the rebuild kit and starts lying out the parts. The problem is that the kit is for a French Solex type 30 single-barrel carb, and the carburetor in the box is a domestic four-barrel.
Factual error: Near the end of the movie, a front view of the overdosing/overdosed twins shows Robert putting the dying twin's head on his lap. A close-up of the dead twin shows blood covering most of the left side of her face and a blue tinge on most of the right side, apparently meant to indicate developing livor mortis (bluish color after death). This twin just died, so it is too early for livor mortis to be visible. Livor mortis is not visible to humans until about two hours after death, but the process does begin sooner (about 20-30 minutes after death). Moreover, the writer failed to show the first stage of death - pallor mortis. The twins were Caucasians with blonde hair, so the dead twin would first turn pale (from blood draining from veins in the skin) about 15 minutes after death. The sudden oozing of blood from the dead twin's forehead was also not an accurate portrayal - she was dead, so her heart no longer pumped blood (so gravity takes over, draining blood). (01:39:58)