In the scrap-filled area in Shy Guy Jungle, hidden among the scraps of trashed paper are the following two messages:



Parakarry was a party member from Paper Mario, while Goombella was a party member from Paper Mario: The Thousand-Year Door. These are the only two references to earlier Paper Mario titles in the game.

Additionally, a third message can be found in the trash heap which simply reads "XD3R-B8HH-9ZR2-FL16". Despite resembling a Club Nintendo or Nintendo eShop code, it registers as invalid when you attempt to input it on either service, and no further information emerged over the years regarding its significance.