List of Mario Sports Mix beta elements
From the Super Mario Wiki
 Early builds
In the pre-final version of the game, the Health Meter in dodgeball was originally going to be split up into four sections, just like the health meter in the Super Mario Galaxy series that is divided into three sections. The final version of it is a meter with one section that depletes correspondingly. There was also a different logo shown at E3 2010. Also, the numbers, placement of bars and other text aesthetics have been altered from the final version.
 Unused data
The game contains a decent number of unused models, including one for the Final Fantasy character, Bahamut.
 Character Selection
For some reason, Waluigi, Toad, Diddy Kong, and Bowser Jr. were unselectable during E3 2010.