More money: 
At the "Press Start" screen, press Y, X, Z, Y,
X, Z, X(2), Y, Z, X, Y.

Increase reputation: 
At the "Press Start" screen, press Y(2), Z, 
X(2), Z, Y(3), X(3).

Level select: 
At the "Press Start" screen, press X(2), Z(2), 
Y(2), Z, X, Y(2), X, Z.