Pidge has twin brother who served on Vehicle Voltron's Air Team, named Chip, further tying together the two series.
King of Beasts GoLion (Lion Voltron) and Armored Fleet Dairugger XV (Vehicle Voltron), while both seemingly similar anime sagas, were originally unrelated.
Commander Yurak sends his troops after the Voltron Force, rather then after the space explorers, even though he should have had no idea that was their new designation, or had ever even seen them in their Lions to that point.
Elevator number one takes Keith to the transport leading to the Green Lion this time, rather then the Black Lion.
When you see Pidge running out of the building befor he makes a crack to the mice, his outfit changes between scenes.
Goof: Have those spacemice discovered the fountain of youth? If they entertained allura as a child(seemingly 6-10 years ago by how old she looked) and they look the same age as back then. Under normal circumstances they'd probably be long dead by now.
Goof: In the sequence where they go through the elevators to the lions. For a split second between the elevators and the vehicles that take them to the lions the one guy(sven?) is replaced with allura(most likely just using future footage since she'll take over for him for like the rest of the show as far as I'm aware).
Goof: Also, when keith boards the black lion it's not in statue form, then it is and uncovers itself.(Again, most likely they just didn't bother to change the footage for one episode)
When the man shows Pidge the way through the cave tunnel to the castle and when Pidge goes through the castle to the defenses room his outfit changes from the white and green Voltron team uniform to his regular green outfit several times.
Sven is referred to, by Keith, as "Voltron's right arm" when in actuality, Sven is the right leg of Voltron. The Blue Lion, which Sven is the pilot, forms the right leg.
In this Episode, Unlike the other Robeasts, The Robeast didn't Explode.
When Hunk finds Twila she is in a brown slave dress, when she wakes up in the infirmary she is in a white and blue dress. After she tells Allura and the Voltron members how she escaped from Planet Doom her outfit changes from the slave outfit to the blue and white dress several times in the next shots.
In the previous episode the four male Voltron members all had their own rooms that they slept in. In this episode they are all sharing one big room to sleep in.
Goof: Keith is supposed to be going to blue lion, but they show him going to black lion.
There is, apparently, an edit for violence in this episode's finale battle. Just before Voltron forms the Blazing Sword, Yurak got hit by some Proton Missiles and then fires lasers from his finger tips at Voltron. After the sword is formed, in the next sequence, there's a gaping hole in Yurak's stomach. This wound is not where the Proton Missiles struck him.
The first episode where they say "Let's Go Voltron Force!" when they form voltron. Previously they just dubbed it "Voltron!" and on one occurance "Go Voltron Force!"
Keith and the rest of the Voltron Force catches on to Planet Doom's scam relatively quickly, based on their experience with Witch Haggar's spells and Lotor's obsession with Allura. Ironically, in the original GoLion episode this is based on, Kogane (Black Lion Pilot/Leader) and the GoLion Team fail to catch on until they see the lengths their enemies Honerva and Sincline (Witch and Prince) are willing to go to get the supposedly dead body of Farla (Princess). Usually, the darker tone of the original anime means that the heroes of GoLion are more savvy than their Voltron Force counterparts.
We learn in this episode Allura cannot be crowned Queen until she marries (chooses a Prince Consort). Considering that the first ruler of Arus was in fact a woman according to the sequel series, Voltron: The Third Dimension, this is an interesting thing to note.
When it's time to use the Blazing Sword, rather then Keith saying "Form Blazing Sword", he simply says "Blazing Sword", and the Blazing Sword is simply there in Voltron's hand, rather then being formed, as usual, by putting the two hands together and forming it around them.
After the giant robot fires it's Metal Piercing Rockets, three of them punch through the head (Voltron's right foot) of the Princess's Blue Lion (Voltron's right leg), one through the nose, right eye, and forehead, and through her interior glass viewscreen. However, after Voltron falls out of control, when Kieth gets it back under control, the three Metal Piercing Rockets are gone, and there is no damage showing they were ever there, inside or outside.
Even though the Yellow Lion lost it's front left paw after firing it's Rip Claw at the enemy robot, the paw crushed in it's hand, and later images showing the Yellow Lion without the paw, when the Lions merge to form Voltron, the missing paw is shown on the Yellow Lion.