Other mistake: When He-Man is fighting against the centurions on the floating disks, he tells the others to get inside a building. As he opens the door to the building, not only does it fall right off the hinges, but his sword also falls right off his back, pulling his cape off with it just as the scene ends. (01:09:20)
Other mistake: When the robot troopers storm the music store, a keyboard (in a slow-mo scene) is blasted. But it does not end up being damaged or even scorched, even though it receives a direct hit.
Other mistake: As the troops come through the door to our world, assuming the are on the street between the buildings and the shot is done outside, the words on the drug store windows they pass are reversed.