Unlock Chicken Suit
Collect 5 feathers per area(except for the final area) and you will unlock the chicken suit (adds +15 to your attributes.)
Change in-game Music
While playing, press A+Y+UP to change the in-game music.
Unlock Santa Claus suit
Max a pose while in the air to unlock the Santa suit. The Santa suit will give you +5 Bone Breaking.
Unlock Speed Skater Suit
If you can collect 100 million global points during all the missions, the speed skater suit will be unlocked.