The Celebi in the mission of the future is shiny. This is the first instance of a shiny Pokemon appearing in the Pokemon Mystery Dungeon series. It's also only the second time a shiny Pokemon has had a major role in the story (the first being Generation II's red Gyarados).

After joining Wigglytuff's Guild, you will unlock the game's second dungeon, Drenched Bluff. If you fail your first two attempts at completing the dungeon, at the end of the second day, you and your partner will be summoned by Chatot to the Guildmaster's chamber, assuming that Wigglytuff is angry about the past two failures. After entering his room however, a chipper Wigglytuff gives you a Reviver Seed, an Oran Berry, and a Max Elixir, encouraging you to do your best to succeed tomorrow.