The movie was not a financial success at first. MGM was planning to pull it back from theaters, but several theater owners persuaded them to keep showing the film. Many owners noticed increasing numbers of young adults attending the film. They were especially enthusiastic about watching the "Star Gate" sequence under the influence of psychedelic drugs. This helped the film to become a financial success.
According to Douglas Trumbull, the total footage shot was some 200 times the final length of the film.
Stanley Kubrick calculated that it would take one person 13 years to hand draw and paint all the mattes needed to insert the assorted spacecraft into the starry backgrounds. Kubrick hired 12 other people, and did the job in one year.
According to Sir Arthur C. Clarke, Stanley Kubrick wanted to get an insurance policy from Lloyds of London to protect himself against losses in the event that extraterrestrial intelligence were discovered before the movie was released. Lloyds refused. Carl Sagan commented, "In the mid-1960s, there was no search being performed for extraterrestrial intelligence, and the chances of accidentally stumbling on extraterrestrial intelligence in a few years' period was extremely small. Lloyds of London missed a good bet."
At the premiere screening, 241 people walked out of the theater, including Rock Hudson, who said, "Will someone tell me what the hell this is about?" Sir Arthur C. Clarke once said, "If you understand '2001' completely, we failed. We wanted to raise far more questions than we answered." Clarke later expressed some concern that the film was too hard to follow, and explained things more fully in the novelization and subsequent sequels.
Stanley Kubrick: [Bathroom] David Bowman explores the bathroom next to his celestial bedroom after travelling through the Star Gate.
