When Largo leaves the Hong Kong airport using personnel exits, the car waiting for him is first seen parked on the side, facing the sense of the road, with the sea on its left. In another plan a few minutes later, while the car has not moved yet, it is shown facing the sea.
The old pictures showing the early life of Nerio Winch during the General Meeting are actually pictures from the town of Turnovo in Bulgaria. For a brief moment a sign in Bulgarian is shown that says Hotel Dobrudgea.
Marcus' gun only reveals it is empty after he pulls the trigger one time. In reality the last fired round will result in the gun slide locking in place in empty position. It will not require an additional trigger pull. In fact it is the round exiting the gun which provides the mechanical force to move the slide back to begin with.
The diver who drowned Nerio Winch was using a rebreather. Rebreathers do not produce bubbles since the exhaled air is circulated back to a compartment containing a substance to absorb the carbon dioxide before oxygen is added for reinhalation.