Corrected entry: When Dave Bowman is attempting to enter Discovery through the emergency airlock we see the smoke from the detonation of the explosive bolts on the door of the pod but where does the door go? The force of the explosion should have fired the pod door into the airlock along with Dave Bowman! An amazing feat and pure luck that Dave Bowman once in the airlock managed to close the airlock door with his eyes closed (not that you could use your eyes in a vacuum because the water on the surface of your eyes would boil off in an airless environment!) and he bounced off the back wall of said airlock and ended up near enough to the airlock door close lever to pull it.
Corrected entry: When Frank goes to retrieve the failing AE-35, he stops the pod hundreds of yards from the ship and floats his way to the ship. If I were doing this, I would park 10 feet from where I needed to go to avoid the possibility of missing my target and getting lost in space.
Corrected entry: After HAL kills Poole we see his body cross paths in an X with the spinning away pod, as if they originated in two different locations.
Corrected entry: The transmission from Earth says that Discovery left three weeks previously, that transmissions take seven minutes and that the journey will take the better part of a year. The speed of light is 186,282 miles/sec. In seven minutes, light travels 78,238,440 miles so the movie statement that Discovery is 80,000,000 miles away from Earth is reasonable. To cover that distance in three weeks, the speed would be around 158,000 mph. To travel half a billion miles at that speed would take a mere nineteen weeks, not the better part of a year. (00:58:35)
Corrected entry: During the base briefing all the participants are walking quickly as they would on Earth. This kind of motion is impossible in the lower moon gravity and it is made clear throughout the film that no artificial gravity technology exists that might allow Earth-normal movement. Later, at the monolith excavation site, the walking is slower and more deliberate as it should be.
Corrected entry: When Bowman blows the pod hatch and is ejected by the air into the ship's airlock, Newton's First Law dictates that the pod should move in the opposite direction, away from the ship.
Corrected entry: When Bowman and Poole get into the pod they have HAL spin it around for seemingly no other reason than to allow HAL to read their lips through the window.
Corrected entry: The scene at the Tycho excavation site where the uncovered monolith emits a radio signal after being illuminated by the rising sun incorrectly shows the sun directly overhead. This would be impossible as the crater Tycho is in the moon's southern hemisphere and the sun would never rise that high during the lunar summer.
Corrected entry: During a number of scenes showing the Discovery 1 from a fixed camera position, the stars are shown moving in the presumed opposite direction of the ship. But since the stars are so far away, there would be almost no movement over the entire trip to Jupiter. (01:30:00 - 02:30:00)
Corrected entry: Dave Bowman parks the pod next to the emergency airlock and blows the door off by detonating the explosive bolts. Since the pod was full of air, the door ought to have been ejected into the airlock and become a rather hazardous projectile. But in the scene it's nowhere to be found. What became of it?
Corrected entry: When Dave is trapped in the pod outside the ship and has to go through the airlock, the solution is impossible (and a real astronaut would have known that). The change in pressure between the pod and the vacuum of space would cause the body to explode without a pressure suit (including the helmet, which was missing). Also, the absolute zero temperature of space would have frozen Dave solid before he ever got the Discovery's door closed.
Corrected entry: When Bowman leaves Discovery to retrieve the AE-35 Unit, he asks HAL to prepare the "B Pod" and HAL powers up and rotates the middle of three pods. Later, when Bowman asks Poole to help him with a problematic transmitter in "C-pod", they go to the pod bay and enter the middle pod which must still be B-pod as no two pods have left the ship and returned to shuffle their positions. (01:12:30 - 01:22:40)
Corrected entry: When Frank Poole and HAL are playing chess, HAL states his move as (in what is called "Descriptive Notation") "Queen to Bishop Three". This is not true, the move he makes is "Queen to Bishop Six".