When they have landed on Delta 3 and met Nikki. Robots are attacking them, we can see Jason (left of screen) taking a spear from a Nikki's men. A few seconds later, we can see Jason taking the spear again.
When Omus is trying to kill Jason with the sonic device. Jason jumps on Omus and take him down. Look closely, Omus has kept his anti-sonic helmet on his head. On the next scene, Jason is taking the helmet, now lying a few feet from Omus.
In the opening lines of text with which the film begins, the word "it's" is misused (??"Man has moved onto the moon, colonised it's surface and erected..."). It should be "its" ("Man has moved onto the moon, colonised its surface...").