Invincibility
Press [Left], [Up], [Right], [Up], [Left]x2, [Up], [Right], [Up], [Left], [Up], [Left], [Start] at the title screen.
Seven vehicles
Press [Left], [Up], [Right], [Up], [Left]x2, [Up], [Right], [Up], [Left], [Up], [Right], [Start] at the title screen.