- Errors in geography: Barrow, Alaska is exactly 201 miles from the Alaskan Pipeline.
- Factual errors: Despite being without sunlight or electricity, most indoor and street scenes appear well-lit.
- Factual errors: In Barrow, the sun doesn't come back above the horizon for 67 days, but it still gets somewhat light between noon and 4:00 p.m.. It does not stay pitch black, as represented in the film.
- Continuity: In the first scene where Eben walks into the sheriff's office and takes off his hat, his hair goes from sticking up to well combed to sticking up again.
- Factual errors: Alaska has no sheriffs; all law enforcement is handled by state troopers or in Barrow, it's the North Slope Borough PD. There are both borough and municipal departments throughout the state along with AST (Alaska State Troopers)
- Factual errors: Everyone is eager to get the "last flight out" before the airport closes down for 30 days. The airport may close for occasional storms, but it never shuts down for 30 days. Alaska Airlines flies to Barrow at least once a day all year.
- Factual errors: The sign for Barrow lists a population of 563. The town actually has more than 4,000 people.
- Factual errors: In the diner, Lucy tells the stranger that no alcohol is allowed during the 30 day break. Barrow is a "damp" town all year; alcohol sales are not legal, but consumption and import are.
- Factual errors: One day in full bright sunshine and the next day in total darkness is a totally inaccurate depiction. Total darkness for many days and then suddenly a full and normal sunrise is not how it works near the poles. As the days gets shorter, sunrise comes later and sunset comes earlier. Eventually you start to get days where the sun barely peaks over the horizon with a few hours of twilight. Even when you reach the middle of this long "dark" period, you'll still have some hours twilight with the sun just under the horizon. Eventually the sun will peek out over the horizon just a little more on each new day as the sunrises come earlier and the sunsets come later.
- Factual errors: In the diner, when Stella pulls a gun on the stranger, Eben asks if the Fire Marshal's office lets her carry a pistol. In Alaska anyone over 21 years old and not a convicted felon or not convicted of a domestic violence crime may carry a concealed handgun.
- Continuity: The color of Stella's eyebrows changes throughout the movie.
- Revealing mistakes: Throughout the movie, some vehicles do not have license plates.
- Continuity: Toward the end, Jake looks out the window of the utilidor and you can still see blood on the ground from the first couple of days that the vampires arrived, even though there was snowfall throughout the whole movie.
- Plot holes: With a town full of people, why would the vampires go on a rampage and kill nearly everyone, spilling a lot of blood they couldn't drink, all in one night? Why wouldn't they just round them up, hold them somehow, and feed as they needed or wanted?
- Factual errors: The Satellite dishes on the communications building are pointed slightly up, but because satellites orbit near the equator, satellite dishes in Alaska need to point horizontally, or in some cases, even slightly down. Because of this it is also unlikely that the characters would have had satellite phones.
- Continuity: Josh Hartnett appears to be growing facial hair over the course of the movie, however no one else appears to have grown any facial hair, including his brother (who at 15 should at least have a few hairs on his chin).
- Incorrectly regarded as goofs: After the vampires have cut the power to the town, most buildings have generators, including the Sheriff Station and the Diner. That explains the well-lit interiors.
- Plot holes: It is rather hard to see how Eben could have hidden from the vampires when his every step would make a clear print in the snow.
- Revealing mistakes: Even though it must be freezing cold, you often don't see the actors' visible breath.
- Continuity: When Eben burns the female vampire with the ultraviolet light, she is hit with the light while facing directly forward and her right arm is swung back, yet she gets burnt on only the left side of her face, as though it was turned, and while her left arm is unharmed, her right arm is burnt, as though it was in front.
- Continuity: In one of the final scenes, the "Number Two" vampire is killed by being thrown into the grinder. However, minutes later he is back with the other vampires and is consistently seen with them through the rest of the movie. He is even seen in a number of close up shots.
- Errors in geography: Snow falls frequently during the movie, including a period with a blizzard. However, extreme northern areas are actually deserts and get very little snow fall. In particular the town of Barrow, AK only receives, on average, .12 inches of snow fall throughout the entire month of December.
- Factual errors: Real grow lamps do not emit any more UV light than regular fluorescent lights, as UV is actually harmful to plants. Either the light should have killed the plants, or the vampires should have suffered burns from normal lighting.
- Revealing mistakes: In the jailhouse scene, if you pause the movie you can see that the bag of "Marijuana" is filled with black pipe cleaners.
- Revealing mistakes: When the vampires are coming for Beau Bower, he removes a road flare from a box, lights it, and throws it back in resulting in a massive explosion. Real road flares are not easily ignited, and would not have exploded like that.
- Plot holes: When Eben returns to the jail, he finds that Jake and his grandmother are missing, presumably taken by the vampires. In the next scene, Jake is in the diner talking about how they fed on his grandmother, but no explanation is given for how he got away. When Eben gets to the diner he is relieved to see Jake there, but does not even ask him about their grandmother.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Revealing mistakes: SPOILER: During the blizzard, when the group is moving from the attic to the general store, the wind is raging, yet the power lines are not moving. No ice has accumulated on the lines, so they aren't frozen solid.
- Factual errors: SPOILER: Near the end, Marlow lights the leaking oil from the pipeline by dropping a match into it. A match dropped into crude oil (or even diesel) would quickly go out and would not ignite the fuel at all.
- Factual errors: SPOILER: Despite the entire town being on fire near the end, none of the snow appears to be melting.
- Plot holes: SPOILER: Sheriff Oleson injected himself with vampire blood because he claimed Stella and the child would be killed by either the spreading flames or the vampires. However, this was a completely pointless act when one considers that the sun began to rise immediately following his defeat of the head vampire and the fire never consumed the car the two were hiding beneath. Had he waited 15 minutes, everything would have been fine.
- Plot holes: SPOILER: Minutes before the sun rises on the last day of night, the vampires try to burn the town down to make the deaths of the citizens of Barrow look like an accident. The large number of turned over cars and heads on pikes on the outskirts of the town would have been highly suspicious to anyone investigating the accident.
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