There was once an "Anger's Power" badge in the beta for Paper Mario. It would cause Mario to gain a dark red tinge of color, and pose angrily. Mario's turn would be controlled automatically in battles, while the partner is controlled by the player. Mario's attack would increase by 2, but is AI neglects common sense, such as jumping on top of spike enemies. The effect is very much similar to the common "Berserk" status of many RPGs.

Chuck Quizmo and his assistant, Vanna T., are possible references to game show host, Chuck Woolery, and hostess, Vanna White.

Paper Mario was also originally going to be named Super Mario RPG 2, though due to complications involving Square Enix, the makers of Super Mario RPG: Legend of the Seven Stars, the name was changed to Super Mario Adventure and later Paper Mario.

In Boo Mansion, if the player goes through the door across the hall from the entrance and jump in the jar inside, Mario will come out of the jar looking like his original 8-bit sprite from Super Mario Bros.

Waiting an additional 10 seconds after the jingle that plays on chapter title cards will cause a complete version of the Super Mario Bros. theme song to start playing.