I got the invisible car/road glitch a few times but it went away pretty quick. A couple collision detection/physics glitches too but nothing too major.
haha, it's not really noticeable unless you pan the view to the side of the car when you or someone else gets in. if it's just you, then the front 2 windows will roll down, if someone gets in the back then the back ones will roll down. it's easier to see if you have tinted windows
You forgot to add better story progression, better side quests, better physics, better aiming, better controls, better map, better car physics, and better customization than GTA.