- Despite being Wario's partner, Waluigi (pictured) has never made an appearance in the Wario series.
- Mario Strikers Charged and Mario & Luigi: Dream Team are the only Mario games to receive an E10 rating by the ESRB.
- In the Japanese version of Paper Mario: The Thousand-Year Door, Peeka wears bunny ears, cuffs, and bow; a reference to the Playboy Bunny suit. In the European and American versions, Peeka instead wears cat ears like her sister, Lahla.
- The Italian names of Private Goomp, Corporal Paraplonk, and Sergeant Guy references the Italian terminology "Tizio, Caio and Sempronio", meaning "three random guys".
