Card Trivia:Perfect Machine King
- "Machine King - 3000 B.C." → "Machine King Prototype" → "Machine King" → "Perfect Machine King"
- This monster's pose in its card artwork is similar to the ending sequence of GaoGaiGar's Final Fusion, from The King of Braves GaoGaiGar.
- The maximum ATK this monster can gain from its own effect is 5500, which requires every Main Monster Zone and both Extra Monster Zones to have a Machine monster.
- In the Virtual World arc of the Yu-Gi-Oh! anime, this card was the first Deck Master to replace another Deck Master: Nezbitt fuses his "Robotic Knight" (which he took the form of) with "Machine King" (who "Robotic Knight" serves, according to its flavor text) to Fusion Summon this monster.
- This monster's number "04" on its left shoulder may reflect the fact that Nezbitt was the fourth member of The Big Five to Duel in the Yu-Gi-Oh! anime.
- This card's OCG/TCG artwork is based on a scene from Yu-Gi-Oh! episode Mechanical Mayhem, Part 2", where Nezbitt first Summoned this monster.
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- Unlike in the anime, this card's OCG/TCG artwork depicts the full body of this monster.