The color of your butterfly pointer and glowing points normally will be blue if you begin the game as player one from the Wii Menu. Use a second Wiimote to start the game and those colors will instead be the same as that of the Wii pointer at the Wii Home menu.
Hold Z while loading your saved game file.
While loading your file, press and maintain "C" button, you will then continue your game with a new weapon : the knife. Enjoy ^^
Hold down "Z" and load a record.