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• Footage of the Saturn V was computer generated specifically for this film; no Saturn V stock footage was used.
• The cast and crew flew between 500 and 600 parabolic arcs in NASA's KC-135 airplane (nicknamed the "Vomit Comet") to achieve real weightlessness. Each of the arcs got them 23 seconds of zero gravity. All of these flights were completed in 13 days. The actual KC135 used (NASA serial number N930NA) was decommissioned in 2000 after 27 years of service and is on display at Ellington Field.
• Zero-Gravity Sequences were filmed at Ellington Field-Houston, TX
• Several items in the movie, including Jim Lovell's jumpsuit and a coffee mug in mission control bear the mission patch for Apollo 8, the mission that took Lovell to the moon for ten orbits a year and a half earlier.
• At one point during the return flight there is a bang and nobody is very alarmed; it's just a "burst helium disk." This was actually a significant event, though an expected consequence of the situation. The helium disk served a protective function in the LM descent engine and, after it burst, they might no longer be able to restart that engine. A final course correction, not shown in the movie, had to be done using thrusters instead.

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