When Cpt. Chapman (Dean Fredricks) and Lt. Ray Makonnen (Richard Weber) exit their damaged ship in order to do repairs, their shadows are cast in two directions. Also, both astronauts are performing an EVA with no safety cable or built in jet maneuvering packs (which is how Ray gets lost).
When the astronauts leave their spaceship to make a repair, they are untethered by any restraint and freely walk on the spacecraft's wing in defiance of the laws of physics.
When Cpt. Chapman (Dean Fredricks) and Lt. Ray Makonnen (Richard Weber) dodge the meteorites, the meteorites can be hear whooshing by. This wouldn't happen in space as there is no atmosphere to carry the sound waves.
While Chapman is tightening the hose that is leaking fuel, he drops the adjustable wrench. It fell out of sight. In space it should have floated.
When Chapman is pulled towards the asteroid, he sits in the left-hand seat. After it lands, he sits in the right-hand seat. In some situations, it is normal for the Pilot to be in command, but once the ship is landed, another officer takes command, sometimes resulting in a change of seating positions.
After arriving on the asteroid, Captain Chapman shrinks in size, while his clothes did not. The Captain fights with the other small people. You can briefly see his shorts in the fight scene inside the space suit.
As the Solorite sets down the unconscious Zetha, her arms reveal voluntary movement.
At 16:48 Frank's air line is broken while standing on the wing of the rocket, yet no evidence of air leakage is shown, i.e. as from the port which was opened to fix the retrorocket feed lines. Also when Frank drops the adjustable wrench inside the rocket ship, despite being in space with no gravity, the wrench falls straight down.
When the opening titles finish, immediately in the first scene the shadow of the boom mic is clearly visible against the overhead girder. It then follows the Colonel across the set towards the left.
When Capt. Chapman first enters the scene in the beginning of the movie, he looks at his wrist to check the time - but he is not wearing a watch.