When Michael arrives at the facility where Victor is being held, Fiona racks the action of her shotgun to load a round into the chamber. When she enters behind Michael to intervene in the fight, she racks the action again, but the previously loaded round is not ejected.
The spike strip was not removed after the truck ran over it, but it was gone when the yellow Corvette drove through a few second later.
Michael fires upwards through the floorboards of a car by ricocheting shots off the ground. This would not work because regardless of entry angle bullets ricochet almost perfectly parallel to the surface they deflect from.
When Michael Westen jumps into the ocean, one of the shots is backwards showing air bubbles entering his nose instead of exiting.
When Michael Westen jumps into the ocean, in one shot you can clearly see a safety diver in the background, in wetsuit and scuba gear.
When they leave the cement plant they turn left which is north on Krome Avenue. It is a half hour drive minimum to downtown Miami, but they do it in one to two minutes.