>footage has tons of cuts
>no reentry footage
>bubbles clearly visible in space(watch the video if you don't believe me)
>fish eye lens use to fake the curve in some shots
The shots inside the craft were taken in a modified zero G plane
The shots of the outside were taken in the NASA neutral buoyancy pool(they rent it out)
They probably used the NASA pool because it already had a good setup for faking space even though they were not filming any actors that day