Enter the following codes at the Press Start screen when holding L1+R1 to get the desired effect:
Get Everything: Circle, Square, Up, Circle, Triangle, Down
All Sleds: Circle, Square, Circle, Square, Circle, Left
All Tracks: Circle, Left, Circle, Right, Circle, Up
All Characters: Circle, Triangle, Circle, Triangle, Circle, Down
Hover Sled: Circle, Triangle, Square, Circle, Triangle, Right