Continuity: Just before Skeletor falls into the pit, his cowl falls off but it reappears on his head in the next shot
Factual errors: The keyboard that Kevin got from the music store seems to play back to front, with the high notes to the left.
Continuity: When Evil-Lyn introduces the bounty hunters to Skeletor, they change position between shots.
Revealing mistakes: Actor's nose visible through the nostrils of Skeletor's mask in close-ups
Revealing mistakes: A "stone" statue bounces on the floor when pushed over.
Factual errors: When He-Man hangs upside down while pursued by Skeletor's troopers, his hair doesn't hang down, making obvious that it's an ordinary shot turned upside down.
Plot holes: When Karg leads Skeletor's troops charge into Gwildor's home, he tells his men to "find the key". It is impossible for him to have known about a second cosmic key as his superiors didn't even know until shortly later on.
Miscellaneous: Near the end of the movie, Det. Lubic pumps the slide on his shotgun three times before firing another shot. He does this as a) a threat, b) a fear-response and c) determination to act, but he is either emptying the gun or, as no shells come out, is using an empty weapon which, surprisingly, actually shoots when he gets around to pulling the trigger!
Revealing mistakes: In the fight scene at the music store, the glass shatters before the troops touch it.
Revealing mistakes: During the final battle in Castle Greyskull, He-Man is hiding behind one of the huge stone pillars with a laser gun he took from a trooper. He makes the motion of firing the gun three times, but only two laser shots come out.
Audio/visual unsynchronized: During the attack on the school, Karg says, "She might know where the key is," to his troops yet his mouth does not move.
Miscellaneous: When Skeletor's entourage begin to arrive through the "door", there is a flipped shot - a "Rexall Drugs" is seen clearly in reverse behind the legion marching right to left.
Audio/visual unsynchronized: At the final battle between He-Man and Skeletor, He-man yells out "I have the power!" as he pulls the sword out of the anvil. You can clearly see that he mouth does not match what he yells.
Continuity: When the Air Centurions are attacking He-Man and his friends, He-Man turns to run through a doorway and his cloak comes loose from his shoulder armor, and the Sword of Power falls from his back. Moments later, when He-Man is giving Gwildor instructions, the cloak and Sword are once again in place.
Revealing mistakes: When He-Man is flying through the air chasing after the Air Centurions you can see through the left side of his body to the street in front of him.