This article is from the Movie Trivia, by Murray Chapman firstname.lastname@example.org with numerous contributions by others.
- The cast and crew flew 628 parabolic flights in NASA's KC-135 airplane to
achieve real weightlessness. Each of the flights got them 23 seconds of zero
gravity, making a total of 4 hours and 44 seconds.
- CAMEO(Marilyn Lovell): an extra in the grandstands at the launch.
- CAMEO(Jim Lovell): captian of the USS Iwo Jima.