On the real car, there's variations in the paint that give it a metallic feel. The Hot Toys car lacks that feel as its simply one consistent piece of matte plastic. Regarding the "soft" detailing of the actual car, like I said some of that is inherent in the original design but there's much more Hot Toys could have done with what's there. Here's a fantastic photo I found of the actual on-screen car used in the original film, on display during the premiere in 1989. Some details that Hot Toys skimmed over which could have gone a long way in selling this as a highly-detailed collectible:
1. The deeper cuts of the lines in the black details along the side of the car, and their chamfered edges that catch the light and make it feel metallic.
2. The mesh ventilation inside the circle detail on the side of the car, and the rivets that surround it.
3. The small rivets along the panels that cover the machine guns.
4. That extra little lip where the glass meets the metal on the canopy.
5. The see-thru wire mesh in the headrests, as opposed to solid molded plastic.
6. Again, the cloudy variations in the body paint that give it a more gunmetal, metallic feel.