Factual error: The car sequence in the beginning is impossible to perform in Italy. 007 drives from Garda Lake to Marbles Caves near Carrara (about 250 km/130 miles if you take the highway or 300 km/150 miles if you take the state route) chased by another car at maximum speed. Not only the trip is too long, but in Italy you have to stop at least at 2 payment tolls (on highways) for such a travel. And at least once at the gas station for refueling (an Aston drinks a lot). If you take the state route it's worst: you must cross several small towns. There are plenty of street cameras and speed controls, no one noticed 2 cars even firing with guns at that speed and dangerous way of driving for such a long time? How many bullets did they have for shooting longer than an hour? And then, more 200 km with a completely destroyed car from Carrara to Siena (what a strange choice for MI6 to place a secret hideout, so distant from where Bond took the quantum man and even on the day of the Palio horse race!) without being noticed or stopped by any police control?They stop you even if you have a broken rear stop light or wrong type of tyres.
Factual error: During the boat chase scene, Bond throws a grappling hook/anchor from the old boat he is driving onto the deck of the rubber boat "riding" his. The rubber boat is then violently yanked off of Bond's boat and crashes. This makes no sense. For the rubber boat to be yanked off that way, the other end of the anchor line would have to be tied to something stationary. However, the other end of the line is just lying in Bond's boat. There's even a shot of it sitting there.
Factual error: James Bond's Aston Martin shown in the opening chase sequence is registered 72 GH3L0, which is meant to be an Italian perspex number plate. Italian plates are always made from aluminium and never show a car logo at the bottom. Furthermore the die face used is wrong and most important: The number does not fit into the Italian registration system: always AA 123AA - hence a completely invented plate is the result.