While the actual 28,000 foot "K2" is in the Karakoram Range in Pakistan, Mt. Cook in New Zealand served as the backdrop for all scenes involving the infamous peak.
The toeless feet of character "Montgomery Wick" seen at the beginning of the film actually belong to mountaineer Mark Wetu, who lost his toes while spending a night outdoors above 28,000 feet during a 1994 attempt on Everest.
The actors performed many of their own stunts.
The first time director Martin Campbell has ever filmed anything in his home country of New Zealand.
The well-known climber Ed Viesturs plays himself in the movie.
Two characters in the movie, Tom McLaren and Frank Williams, are named after successful Formula One (auto-racing) teams. The latter even has the same name as the team manager.
The Bench brothers were based on the Burgess twins, Alan & Adrian, who are two climbers from Yorkshire, England, UK.
Montgomery Wick's name is an obvious reference to Thomas Montgomerie and Jim Wickwire. Montgomerie discovered K2, and Jim Wickwire was the first American to climb K2. Wickwire also lost several toes on the mountain, similar to the character Montgomery Wick.