Can you spot the differences on this Porsche Carrera GTZ? A beautiful dark green Porsche Carrera GTZ by @zagato1919 made a rare appearance at the @concours_of_elegance last weekend, blowing-away and confusing attendees in equal parts with its subtle yet impactful differences compared to the standard car. Can you name all the changes? Our full review of the Concours of Elegance is now live at classicdriver.com Photos by @mikeysnelgar