I watched this the other day.
It was neat to see them travel to Denebria. I sensed that Flipshot and Hydron were a little hesistant to travel with He-Man and preferred staying on the ship. Are most from Primus kinda like the Eloi from "The Time Machine"? Caz definitely isn't like that.
Also, liked the Meliac character. He definitely had honor by sparing Caz and later tossing the sword back to He-Man. I hope he shows up again in a future episode. He helps show that not all of Denebria is evil. This episode had a nice sci-fi feel to it with Gorn City, the aliens, and the mines.
Funny nod to the MOTU movie with Skeletor falling and rising from the well at the end.
As for earlier in the episode and the lesson...I guess Slush Head is supposed to be quite dimwitted.