Level select:
Press X(2), White(2), Y(2), White, X, Y, Y, X, White at the "Press Start" screen.
Extra money:
Press Y, X, White, Y, X, White, X(2), Y, White, X, Y at the "Press Start" screen.
Reputation:
Press Y(2), White, X(2), White, Y(3), X(3) at the "Press Start" screen.