I think all the differences that everyone pointed out between the concept and the production car could be termed "minor" as it relates to the car's general (at a distance) appearance, with the exception of how Dodge made it "shorter, stubbier, and more narrow". Due to these things it actually lost some of its smoother curves. The longer hood and trunk of the concept look significantly better than the production car.

Overall, the production Challenger looks 10 times better than any other car on the road. If Dodge had not made the above changes it would look 50 times better than any other car on the road though.