Deliberate mistake: Dr. Chandra returns to the Leonov at the end of the film with the device that Dr. Floyd designed to cut HAL's memory circuits. He hands the device back to Dr. Floyd, who tosses it in the air and catches it when it falls back into his hand. One problem - there was no gravity on the ship at the time. (01:44:00)
Factual error: While the Leonov has a centrifugal section to simulate gravity, the ship's bridge is not part of it (evidenced by the stationary views outside its portholes). Yet in various scenes, including the one when Floyd rushes in to discuss his plan to return to Earth sooner with Tanya, gravity seems quite evident. Floyd marches across the compartment onto the raised pilot area's floor, then steps down from it, his foot landing audibly. Tanya's open jacket also hangs down normally as she moves about. Yet when Floyd demonstrates his plan using two pens, they float in mid air. (01:26:50)
Victor Milson: Millson to Floyd: It's been twelve hours since I made my request for information! I need a reply - all hell is breaking loose down here! I have enough problems without you pulling some kind of a stunt! I just hope there's an Earth for you to return to! Make that report I asked for and make it immediately.
Trivia: In the nursing home scene, the nurse at the desk is reading Time magazine. The cover concerns the US/Soviet conflict integral to the plot. If you look closely, the US President's picture is a colored drawing of Arthur C. Clarke and the Soviet Premier's picture is a colored drawing of the director of 2001, Stanley Kubrick. (01:17:18)
Question: In the original film, the Discovery's onboard computer states: "I am a HAL 9000 Computer, Production Number 3. I became operational at the HAL plant in Urbana, Illinois, on the 12th of January, 1992." So, "HAL" was a manufacturer identification prefix (standing for Heuristically-programmed ALgorithmic Computers), "9000" was its model number, and "No.3" was its production lineage. In this sequel, however, Dr. Chandra is chatting with one of HAL's earth-based twin computers which has a feminine voice and is called "SAL"; but how can they arbitrarily change its manufacturer identification prefix? Being produced by the HAL plant in Urbana, Illinois, and being identical to the computer aboard the Discovery, the twin's name should have a different production number, but it should still be called "HAL," should it not?
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