[Cadaverous Pallor]

The only moment I know of when characters are in outer space and should die is when the Falcon lands inside an asteroid (really, inside a large creature) and decide to go see the inside of the asteroid wearing nothing but an oxygen mask. That's always bugged me as a huge oversight. There is no atmosphere on an asteroid, and without pressurized suits, they would explode.

One could (poorly) argue that there's an atmosphere inside the creature...but the fact that the creature exists in space pushes the whole sequence into complete fantasy territory. Once you've got that, well, why not have X-Wings that act like planes?