The film originally premiered at 160 minutes. After the premiere director Kubrick removed about twenty minutes worth of scenes and made a few changes:- a few scenes in the "Dawn of man" opening section and on the moon where the monolith is discovered where shortened;- Many scenes detailing routine life of the astronauts aboard the "Discovery" spaceship were removed;- the titles "Jupiter Mission, 18 months later" and "Jupiter Beyond the Infinite" were added between sections.
Most current video versions contain the 139-minute general release version plus the original overture, entr'acte and exit music from the roadshow version.
Some versions have title cards on-screen during the Overture and Entr'acte sections, while other versions omit these titles and simply play the music over a black screen.
The original theatrical release had Ligeti's Atmospheres to a black screen for roughly 8 to 10 minutes before the movie began, and Strauss' The Blue Danube well after the end credits to a black screen. This "overture" and postfilm music survived the premiere edits mentioned above. For a long while, revivals and all television and cable broadcasts would cut both, starting directly at the beginning of the credits and ending immediately after the end credits, but current revivals in such places as The Film Forum in New York City and cable channels like The Sundance Channel, Bravo, The Independent Channel and PBS have been restoring the pre- and post-movie music.
The DVD version from MGM omits a few seconds of dialogue from the scene when Dave is attempting to re-enter the Discovery through the pod bay doors. Dave asks several times "Do you read me, HAL?". In the original release, HAL answers "Affirmative Dave, I read you". In the DVD version, HAL only answers "Affirmative Dave", though the English subtitles still contains "I read you." The DVD release from Warner Bros. corrects this and HAL's full line of dialogue is heard.
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