Factual error: While Aron is copying a page from the Utah Canyon-lands guidebook, a location labeled "Aron Ralston's chockstone" can be seen, despite the fact that the film takes place during the incident. This is because the actual Utah Canyons guidebook was used during filming, which had been updated to include said location. (00:39:15)
Factual error: In both scenes with Brian, Aron's boss, he is wearing a T-shirt that can be identified as being a product of the website www.someecards.com. This website did not launch until 2007, but the movie is set in 2003.
Factual error: Though the film takes place in 2003, modern-styled (2010) Mountain Dew cans can be seen during Aron's dream sequence when he attends the party.
Factual error: The film takes place in April of 2003 and a flashback shows Aron Ralston attending a Utah Jazz game. However the theme of the basketball court was not used by the Jazz until the start of the 2004-05 NBA season. Additionally the name of the arena displayed on the court is Energy Solutions Arena whereas the building was called the Delta Center until November 2006.
Factual error: The slot canyon with the underground pool that Aron and the girls dive in is nowhere near Blue John Canyon. It is actually the Homestead Resort Crater located in Midway, Utah approximately 200 miles northwest.
Chosen answer: The actual name is Bluejohn Canyon. According to online tourist info for Utah, "It appears to have been named after a minor Robbers Roost outlaw by the name of John Griffith. Griffith had one blue eye and one brown eye and thus was saddled with the nickname "Blue John." It is recognized that he kept stolen horses in the area, perhaps watering them at nearby springs. In the fall of 1899 Griffith is reported to have put in at Hite with a small boat with the intention of reaching Lee's Ferry. He was never heard from again."
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