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Advanced Options
For greater control, hold L1 + L2 + R1 + R2 while selecting the Options menu.
Debug Mode (Japanese version)
Choose Goodies from the main menu, then hold any Shift button and press Select. If you did this right you'll see four numbers in the lower right corner of the screen. To enter a number, hold a combination of SHIFT buttons (see below), then press SELECT to enter the digit. When entering numbers, R1=1, R2=2, L1=4 and L2=8. By combining buttons (eg. R1+L2=9) it is possible to create any hex (base 16) number. I've included a few codes below. Please let me know if you discover more. 
GOODY              NUMBER
Extra Characters   4e43
Extra Tracks       4154
Tank Combat        5443
Submarine X        5358
Motor Toon R       4631
The Ghost in the Machine
How'd you like to race against the best players from Sony? To do so, hold R1 while selecting any memory card option (i.e., Load). You can now watch or race against the Sony team's best times.