Except for closeups, the corpses of the plague victims in the corridors are clearly mannequins.
Charmingly the 'stars' outside the space station are frequently revealed to be fairy lights on black cloth each time people move quickly enough down the curved corridor to cause a slight breeze.
When Professor Kellman sabotages the radio log tape there's a sound effect of a tape fast forwarding. However, Kellman never pulls the tape across the head of the machine which would be necessary to produce sound.