On the options screen there is something called "trails" adjusting this will do what exactly to the game,at the moment i find the game a little drab to look at?
Ive flicked it on and off before and never really noticed a difference. So dont know what it does. It doesnt mention it in the manual either.
You get a smearing motionblur type effect most obvious on bright lights :kinda like akira but naff. leave it off.