When Alexis goes to get the car from the garage toward the end of the movie, there is a very evident dent near the door handle. The dent is not evident when he gets out of the car in the next scene.
Hydra is the Greek island to which Raf Vallone ships Anthony Perkins's Aston-Martin sports car---but by law no cars or motorbikes are allowed on Hydra! That doesn't stop Perkins from tearing around the island at top speed and shouting along to Bach on the car radio.