There are 3 unused attacks for Mario and Luigi present in the games files, Ice flower, Yoo who cannon, and Jump helmet.
Contributed by MeleeWaluigi
The developers considered making Bowser a playable character early on in the planning but scrapped the idea to keep the focus on Mario and Luigi.
Contributed by The_Maxious
A frame of Bowser Jr. slamming his hammer is graphically faulty.
Touching Luigi's cap on the title screen will allow the player to mess around with his mustache, nose, and cap, as they would during game play. Each action made to Luigi will alter the top screen.
Contributed by gamerofgames
