Stunt Racer 64 

Snowboard racer 
Enter "BUCKYB" as a name.

Milk truck 
Enter "MOOOOO" as a name.

Infinite money 
While playing a game:
press B, Z(2), B, Up, C-Down, Z, Start on controller two.

Overhead view 
While playing a game:
press Up(3), A, Left, A(3) on controller two.

Blurred view 
While playing a game,:
press B, Left, Up, Right(3), A, Start(2), Z, Right, A, Up, Z, C-Down, Start on controller two.