Get Frame Rate Option:
At the title screen press Up, Triangle, Left, Circle, Down, X, Right, Square

Unlock Rival:
Finish the game using Ciel and don't lose to Rival

Unlock Copain:
Finish the game using Femme

Unlock Hardi:
Finish the game with Ciel AND Copain and get the top money rank using those characters. Now finish the game using Rival to get Hardi for Time attack and survival modes

Unlock Survival Mode:
Finish the game with Copain and get the top money rank

Get Camera Options:
Finish the game with a SS ranking

Get Time Attack Mode:
Finish the game using Ciel and get the top money rank

Unlock Scene Select Mode:
Finish the game using all 4 characters