Continuity: The number of cigarettes that Lisa has dropped in the toilet.
Boom mic visible: In the middle of the movie in one of the rooms at the hotel where they just discovered a dead body (which disappears).
Continuity: Everyone goes into the lab and it begins to snow. Jennifer, Lisa, Bryce, and Flynt are the only people left in town. Yet, when Flynt leaves the lab later, there are footprints and tracks in the snow.
Continuity: The band-aid on Sherrif Hammond's neck changes repeatedly throughout the movie without any way it could have been changed.
Revealing mistakes: The spent 9mm shell casings on the floor of the police station are from blank rounds.
Continuity: The spare tire on the back of Jenny's white Jeep disappears and reappears numerous times while driving into Snowfield.
Continuity: When Lisa is in the bathroom, she drops a cigarette into the sink. The position of the cigarette changes in the next shot.
Errors made by characters (possibly deliberate errors by the filmmakers): At the beginning of the film, Lisa Pailey is asking what the population of the little Colorado ski-town is. Her sister says, "The population is 400, but in the summer all the tourists flock in and there's more like 4000". If it's a ski-tourist town, there would be more people in the winter instead of the summer.
Continuity: When Flyte turns off the power in the "tank" so that they won't be overheard through the electronics, there is still one computer screen on and functioning.
Audio/visual unsynchronized: In the bakery, when the timer goes off, it makes a bell sound. The timer is an electronic timer that makes a beeping noise when it runs out.