Card Trivia:Castle Walls
- This card has a stronger Quick-Play Spell Card counterpart, "The Reliable Guardian".
- This card is effectively the defensive counterpart to "Reinforcements", and has the opposite effect of "Snake Fang".
- The first generation Spanish editions of this card had "Aumenta el DEF" instead of "Aumenta la DEF" ("Increase the DEF") on the lore.