Goof: After Slithe opens fire on Lion-O in Castle Plun-Darr, Lion-O yells "Ho!" which lengthens his sword. We see that the Eye of Thundera is open. But when it goes to a close-up shot of him, the Eye is closed.
Goof: It is dark and gloomy outside of Castle Plun-Darr as the ThunderKittens return with Lion-O and make their way inside. When they are suddenly ambushed by the Mutants, Lion-O jumps in front of Slithe. When it goes to a frontal shot of him, instead of being inside the castle, it shows him standing outside with grass, trees, and blue skies behind him. When it jumps back to the side view again, they are still in the castle.
Wilykat: I don't wanna be treated like a kitten all my life.
Lion-O: (giving the Kittens the other Thundercats weapons) Go on. If you hurry, you can beat them back to the Lair.
Wilykit: But, Lion-O...
Lion-O: For once, would you please do as I say?
Wilykat: Thanks, Lion-O.
Lion-O: Of all the irresponsible, inexcusable...
Wilykit: We're sorry.
Lion-O: Oh, look, I ought to give you two the lecture of your lives, but we don't have time for a lecture right now.
Mumm-Ra and Vultureman did not appear in this episode.