Lion-O flung rocks at Monkian which exploded into fire. Monkian called them "fire rocks" but apparantly they are not the same kind of fire rocks previously identified as Thundranium or they would have weakened Lion-O.
The Thunderkittens believed they had explored every inch of the Cave of Infinity. When they got lost they realized they had not. While exploring, they did not know the Under-Earthmen, which means they never saw where they lived.
Monsters which come out of the Thunderkittens capsules are filled with air and can be punctured.
None of the other Thundercats used their weapons on Lion-O during the Anointment, trials. However, the Thunderkittens did use their pellets, which are their weapons, against him.
When Lion-O's under water in the cave, he makes mention that the water is like putty and he can't breathe. However, since he's under water, he shouldn't be able to breathe anyway. In past episodes, Thundercats had to hold their breath under water or use breathing masks.
When the map of the maze is up on the screen in Cats Lair, you can see the outline of the Thundercat symbol in the middle of the maze.
At the beginning Lion-O set up a deception, a rock to resemble himself. At first glance, the rock clearly has Lion-O's markings, his hair and clothes on the back side making you think Lion-O carved the rock to match his appearance. But when the Mutants get close and hit it, there is clearly nothing about it that resembled Lion-O at all. He had not carved his image into it.
Wilykit & Wilykat: You tricked us!
Lion-O: Yep. It's been a trick for a trick all day. But it's the last trick that wins the game.
Wilykit: And we were worried about him!
Wilykat: You stopped to make friends?
Wilykit: And risked failing your Anointment trials?
Lion-O: I didn't plan it that way, but it turns out you can't have too many friends, as you two found out.
Wilykit: Lion-O is fighting the monster! I thought he'd avoid it and take another wrong trail.
Wilykat: Your capsule was a dud. Our trick might have worked with two monsters.
Wilykit: At least it slowed him down!
Lion-O: So, we start even after all, despite your secret shortcut.
Wilykit: It looks like it.
Lion-O: Any time you're ready, then.
Wilykat: We're always ready!
This is the second episode in which Tygra did not appear.
First Appearance: (location) The Cave of Infinity
Under-Earthmen were not named in the episode. They are a race of men who lived in the Cave of Infinity and called Lion-O an "Over-Earthman". They have large, bulgy eyes which could not stand light as a result of having lived in the caves for so long. They were forced to hide in the caves by men who feared their books. But as a result of their eyes no longer being able to tolerate the light, they could no longer read their books.
First Appearance: Under-Earthmen
Mumm-Ra and Vultureman did not appear in this episode.