Astronaut Clooney informs medical doctor Bullock what happens medically during oxygen depravation.
Why Bullock's hair, in otherwise convincing zero-G scenes, did not float freely on her head.
Why anyone is impressed with a zero-G film 45 years after being impressed with "2001:A Space Odyssey".
Nearly all satellites orbit Earth west to east yet all satellite debris portrayed orbited east to west.
Satellite communications were disrupted at 230 mi up, but communications satellites orbit 100x higher.
Why we enjoy a SciFi film set in make-believe space more than we enjoy actual people set in real space.