things i'd check...
* seats slide/adjust with ease
* shifters (silver are original, black ball knobs are happ
replacements and actually function better)
* wheel operation and is feedback correct.
(i.e. does it pull to the side, even when driving straight?)
* are the speech calls correct? (pitboss says relevant things,
or is it all fucked up?)
* check for correct sprite colors. odd car colors could signify rom problems.
play it a a couple times, of course.