Deleted scenes from the GoLion finale "Burn Galra Castle" this was based on included injuries from the duel, soldiers (see trivia for "Lotor's Clone") being used as human cannonballs, a soldier's head detonating, explosions killing several slaves, and the captured hero (Sven in the American version, Sven's brother in the Japanese version) stabbing Lotor before both fell, fatally.
The only time Castle Doom was called Dark Stone Castle.
This was originally supposed to be the series finale. However, a second Lion Force season was rushed into production for the American audiences.
Pidge sends a letter to his brother Chip, who is a member of the vehicle Voltron Force. In the original Japanese version, the two characters are not related.
The Flying Fortress crew wear olive-drab versions of the Voltron Force uniforms. This suggests the design is an Arusian flight suit, rather than exclusive to the Voltron team.