Carwardine Parks/Nintendo Demos

Super Mario Bros.

 * The game over theme is different
 * Lakitu bug wasn't broken
 * You have 50 lives, possibly for testing

Super Mario Bros. 2

 * The blocks actually have an 8th animation frame
 * You can't run

Super Mario Bros. 3

 * The Japanese title screen is present
 * The original level into is present
 * You get shrunk back to small if you hit an enemy
 * The green fortress palette is used in World 3's fortress

Super Mario World

 * The title screen logo is the Japanese logo
 * Yoshi can eat dolphins
 * Peach's animations are from the Japanese version
 * The Funky text says "You Are Super Player!"
 * Cheese Bridge is called Rice Cracker Bridge

Super Mario All-Stars

 * The title screen uses the original audio

Super Mario 64

 * Mario bends his knees when riding a Koopa shell
 * Jolly Roger Bay's portrait is the JP version
 * One of the Jolly Roger Bay stars is out in the open, not in a box
 * The baby penguin star is located in a different spot
 * Charles Martinet and Leslie Swan's newly recorded lines aren't present
 * The Chain Chomp still has it's original sound effect

Super Mario Sunshine

 * You can't turn subtitles off
 * The Japanese sign texture is present

Super Mario Galaxy

 * Star Get instead of You got a star

New Super Mario Bros. Wii

 * A giant buzzy beetle appears in one of the levels

Super Mario Galaxy 2

 * The beta logo is on the title