Factual error: As the gun-toting Norseman approaches the buildings, Garry smashes the single-pane window with his handgun. It is inconceivable that the glazing in a structure near the South Pole would be single-pane glass, that would provide minimal insulation and which could be broken so easily.
Factual error: The "big giveaway" that happens at 9pm across the whole country would have to happen at least five different consecutive times due to time zones. The "big giveaway" in the most eastern time zone would be successful, but further west it would be earlier than 9pm.
Factual error: The movie is set in 1974. The Sony walkman was introduced in 1979, yet Sonny is seen listening to one.
Suggested correction: There's no requirement that the movie must take place in 1974. The movie merely takes inspiration from the events preceding the original film and is a follow-up in spirit rather than a literal prequel.
Factual error: In the first story, Father's Day, it is dark at 7:00. In the middle of June, the sun stays up until at least 8. Or even 9 up north.
Factual error: Jason picks up a red hot poker from the fireplace and it sizzles. Fire pokers only sizzle if they touch something. (01:08:56)
Factual error: During the climax of the film, coffins from the cemetery below rise out of the ground. Only problem: they're rising vertically. Coffins are laid horizontally.