Card Trivia:Red-Eyes Darkness Metal Dragon
- This is the cover card for Premium Pack Vol.4, Premium Pack Vol.15, and Limited Edition 11, as well as one of the cover cards of the box of Legendary Duelists: Season 1.
- This card is the Metal counterpart of "Red-Eyes Darkness Dragon".
- This card shares the same ATK and DEF as its fellow "Red-Eyes" Metal counterpart, "Red-Eyes Black Metal Dragon".
- However, unlike "Red-Eyes Black Metal Dragon", this card is a Dragon-Type monster and not a Machine-Type monster.
- Also, unlike other "Red-Eyes" monsters, the direct relation of this card's printed version to them is its name and artwork, since the requirement of a "Red-Eyes" monster to Special Summon it was completely removed, rather than altered.
- This card shares the same ATK and DEF as its fellow "Red-Eyes" Metal counterpart, "Red-Eyes Black Metal Dragon".
- This card has a Link counterpart: "Darkness Metal, the Dragon of Dark Steel".
- This card has a Zombie counterpart: "Red-Eyes Zombie Dragon Lord".
- This card's 2nd OCG/TCG artwork features the Spirit Keys underneath its feet, referencing its appearance in the Yu-Gi-Oh! GX anime.
- This card's summoning conditions in the Yu-Gi-Oh! GX anime are similar to that of "Red-Eyes Black Metal Dragon", since both cards require a specific "Red-Eyes" monster equipped with a specific Trap Card as Tribute: this card requires "Red-Eyes Darkness Dragon" equipped with "Metal Plus", and "Red-Eyes Black Metal Dragon" requires "Red-Eyes Black Dragon" equipped with "Metalmorph".
- Also, in both instances, the Trap Cards they were equipped with featured "Magic-Reflection Armor" in their Japanese names.
- This card and "Dandylion" were the 2009 Shonen Jump subscription promos. They were released together in Absolute Powerforce: Special Edition.