The developers originally considered calling the game "New Super Mario Bros. Gold" because of its theme of "one million coins", and the various features surrounding the idea. However, they felt that many of the games levels stood on their own, even without considering the coin collecting elements, and so they decided to emphasize that it still had the classic Mario gameplay by calling it New Super Mario Bros. 2.
When the player enters Coin Rush for the first time, they will receive several informative messages; the second message, "Exchange Coin Rush records with people you meet! Your Mii character and name will be also be exchanged", contains a typo by saying "be" twice in the second sentence. This typo is only present in the US version of the game.