- The kanji 千年 in this card's name is pronounced sauzando "thousand", although it properly means "thousand years; millennium", which is representative of "Thousand Dragon"'s age. It is pronounced sennen "thousand years" or mireniamu "millennium" in the names of the Millennium Item.
- This card, being a fusion of "Baby Dragon" and "Time Wizard", is a reference to the manga where "Baby Dragon" would age to "Thousand Dragon" if "Time Wizard" successfully used its effect. This kind of summoning was to be later translated more accurately to the card game with "Dark Sage".
- This card is one of the first two Fusion Monsters to be released in a TCG Starter Deck; the other one being "Flame Swordsman". They were both released in Starter Deck: Joey.
- This card lacks a passcode.
- Whereas regular Secret Rares are supposed to have their foil in a top-right-to-bottom-left direction, Secret Rare versions of this card have foil in the top-left-to-bottom-right direction.
- This card's first OCG/TCG artwork and second OCG artwork are taken from Yu-Gi-Oh! Duelist Duel 11: "Things that Don't Change" and Yu-Gi-Oh! Duelist Duel 63: "Betting to Win!", respectively. They are specifically taken from the panels showing the final result of "Baby Dragon" being affected by "Time Wizard".
- "Baby Dragon" and "Hundred Dragon" are both younger versions of this monster.
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