- The castle being destroyed in "Royal Surrender" is the castle from "Royal Decree", "Imperial Iron Wall", "Catapult Zone" and "Rock Bombardment".
- The effect of this card is also symbolic, as "Royal Decree" can block its effect but is also a Continuous Trap Card, meaning "Royal Surrender" could be played to counter it.
- This card has a Spell-negating counterpart in "Spell-Stopping Statute".
- The king (and the castle) featured in "Royal Decree" is always in a Trap Card or a Trap Card that has something to do with other Trap Cards, like "Royal Decree" and "Royal Surrender". Similarly, the king featured on "Imperial Order" and "Spell-Stopping Statute" is in a Trap Card that has something to do with Spell Cards.
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