Most of it is explained in other sites, and in OKeijiDragon's video. It's mostly the change of Rock's hair, and the different layout for the Apple Market that are the more interesting bits. Rock's buster shots leaves a circular effect and a different sound effect after it hit an enemy, and the icon for the Special Weapons on the right side of the screen is different than the final version.
Oh I remember, you can't skip the cutscenes in Capcom Friendly Club or NEO versions. Those are the demos of the final game.
I took my own CFC disc and made a rip of it, and shared it over at Protodude's blog. I didn't get much credit for the sharing tho. ^^;
And I do own Biohazard 2 Trial Edition, if you choose Information, you can play NEO, and it was worth it to buy that.