If these guys aren’t all being sucked out into space, then a similar emergency field around a small door isn’t a stretch.
Seriously people, we’re nitpicking movies where you can hear sounds in space.
They can have shields that allow for open air on the exterior of the Death Star. Its’ that way when the Falcon lands in the first movie too. But in general I agree with your point, the scientific stuff doesn’t need to be nitpicked as long as its not obvious and really dumb. For instance, the asteroids in the asteroid field would never be that close together in real life. And when the Millenium Falcon flips and spins like it does when it turns around on Bespin, all of the occupants would be thrown around and probably incapacitated if not killed.