Continuity mistake: When Luther Blair and Captain Larson have been captured, the rest of the crew return to the ship. Later, Dr Higgins checks his watch. When the crew arrived at the planet they removed their spacesuits to reveal their short-sleeved shirts, yet the close up shows the watch below the long sleeve of his space suit, not just his bare skin.
Continuity mistake: When Luther Blair rescues Captain Larson from his cell towards the end of the film they are both shown exiting the cell with pistols drawn and ready. When the shot cuts to the corridor outside both their pistols have now disappeared from their hands.
