The car used in Greece was a 1956 Cadillac Series 60 Fleetwood Special Sedan. However 2 cars were used, one with black wall tires and one with period-correct white wall tires. When in the city, the car has white wall tires. Once the car gets on a country road, the tires change to black wall. It could also be that the city scenes were shot together, likewise the country scenes and in the interim the tires were changed.