In celebration of this film, see Indiewire's article below on "5 Things You Probably Didn't Know About The Film." It's a cool list.
"1. The Film Was Originally Called "Journey Beyond The Stars" - While it was based principally on author Arthur C. Clarke's short story "The Sentinel," the book "2001: A Space Odyssey" was actually written by Clarke at the same time as he wrote the screenplay with Kubrick. The duo originally referred to it as "How The Solar System Was Won," and it was initally announced under the name "Journey Beyond The Stars." Clarke wrote in his behind-the-scenes book "The Lost Worlds Of 2001" that they also considered "Universe," "Tunnel To The Stars" and "Planetfall" before landing on the eventual winner.
2. Kubrick Delivered The Film Sixteen Months Over Schedule, Having Nearly Doubled The Budget - Kubrick's last film, "Eyes Wide Shut," was a famously endless shoot, but this was not exactly something new. The famous perfectionist often went massively over budget and schedule, and particularly so on "2001: A Space Odyssey:" he went over the $6 million budget by $4.5 million (roughly equivalent to $25 million today), and arrived sixteen months late. Which should be a comfort to Andrew Stanton, if nothing else.
3. Seventeen Minutes Of Footage Cut At The Last Minute Was Recently Rediscovered - Given how much footage was shot (as much as two hundred times the length of the final cut), it's unsurprising that enormous amounts were left on the cutting room floor, but it's unlikely ever to surface: Kubrick always burnt his negatives after a film was finished. But the director did cut nineteen minutes after release, seventeen minutes of which were rediscovered in 2010 in a vault in a Kansas salt mine. It's yet to see the public light of day, but surely something is planned soon.
4. Jack Kirby Wrote A Marvel Comic Based On The Move, That Spun Off Into A Superhero Series -
Even aside from Peter Hyams' lesser 1984 sequel "2010: The Year We Make Contact," the tale's gone on to have life elsewhere. Clarke wrote two more novels, "2061: Odyssey Three" in 1987 and 1997's "3001: The Final Odyssey" (Tom Hanks reportedly picked up the rights to the latter with the idea that he might direct it). Perhaps most curiously, a decade after the film was released, Marvel produced a ten-issue series by comics legend Jack Kirby that expanded on the film. The series saw the first appearance of Kirby's robot superhero character "Machine Man," who would later go on to become a stalwart part of the Marvel universe.
5. HAL 9000 Actor Douglas Rain Reprised His Role...In Woody Allen's 'Sleeper' - The film's been much parodied over the years, by everyone from Mel Brooks to "The Simpsons," but few went to the same lengths as Woody Allen. When he made his science-fiction comedy "Sleeper," the writer-director-star wrote an evil computer into the climax of the film, and got none another than Canadian stage veteran Douglas Rain, who lent his voice to HAL 9000 in "2001," to voice it in an uncredited cameo. Watch Woody Allen talk about his first impressions and growing to love Kubrick's movie below."