I actually had to sign up just to reply to this topic, because I might have some answers for you all!
I have the same manual that the original poster has..
Monochrome with the "KRAZY RACERS" typo on the back.
I remember I got the game early 2002 at K-Mart because it was already on clearance. I think I only ended up paying 10 bucks for it. I know I got it in 2002 because I got it before I met my finance, who I also met in 2002.
Since I got the game not too long after it's release (8 or so months, tops) it's probably the first printing, and it was just an error by Konami. They probably printed the manual in black and white because they had to get it out for the GBA release and were running low on time.
But to Belmont Yang, you are making way too big of a deal out of this. This typo won't add any value to your game. Since it was probably the first pressing, there are probably several thousand out there, and no one in their right mind would actually pay extra money for a game because of a typo on the back. If the wrong character art was used somewhere or something major was wrong with it, then ok, maybe it'd add 10 or 20 bucks to the value. But stop acting like you have gold in your hands, no matter how rare it is it's not valuable or sought after.