Card Trivia:Centerfrog
- This card's OCG name, "Sleep Frog"「ねガエル（negaeru)」is a pun on the Japanese term which means "to switch sides and betray".
- This card's name and effect of changing this card into Defense Position reflects this, as the monster is sleeping on its side, which is typically the position of Defense Position monsters.
- This card's effect of switching control of the opponent's monsters reflects the term as well, as the two copies of this card will allow the opponent's monster to "betray" their owner by switching to the player's sides.
- The "Center" in this card's TCG name also reflects this effect, as it can allow the player to take control of the opponents' monsters who are placed in the "center" between the two copies of this card on their field.
- This monster's design featuring a black circle on its belly and this card's effect is also a reference to the reversi board game, where the player can capture an opponent's pieces by switching over the sides of the pieces from white to black and vice-versa, whereas this card can "capture" your opponent's monsters by switching them to the player's sides.
