Other mistake: When Bond drives into the train tunnel, below the train cart with the jewelry, we see that welding is going on in the other train cart. But that is before the bomb is placed in the hole below the cannon. There is no sign of weldings, and no sign of welding equipment once we get inside that cart.
Add timeJacob La Cour
Other mistake: When Bond starts up his plane during the pre-credit chase scene, the Cuban forces are visible at the horizon closing fast - they have to be to keep the tension up - but with the closing speed and the time it takes for Bond to roll out his plane, there would never be enough street left for him to get airborne.