Continuity mistake: In the final chase scene, the yellow Hummer starts out with an open sunroof. As it barrels through the shantytown, interior shots of the Hummer show it with a large overhead bank of storage compartments, while overhead shots show the sunroof. When the chase finally reaches Gitmo, the Hummer once again is shown with an open sunroof.
Other mistake: When Mike goes to Marcus's house to apologize, as Marcus lets Mike in and they walk through the house you can see the corner of a very nice built-in pool through the glass doors, even though a large part of the beginning and the end of the movie take place in Marcus's '$3900' portable pool and its subsequent replacement.
Continuity mistake: During the shootout in the street, Will Smith does a sharp turn while shooting at the Haitians and ends up killing one Haitian who falls back on a car. A few shots later at a different camera angle, you see the same Haitian man get killed and fall back on the hood of a car.
Continuity mistake: When the Haitians are on the highway, one of the cars fall off and is dragged by a chain and it hits the large black Ford beside it, with just a bridge wall. Then when the thug (the one who says, "Jesus f***") is shown inside the car, there is a Maersk Sealand vehicle there.
Continuity mistake: Near the end of the shootout scene in the pink house, Mike starts to bring his gun up to shoot the Haitian through the wall, and the gun is empty - the slide is back. When the camera changes the slide is forward - indicating the gun has bullets inside. He then shoots through the wall killing the Haitian.
Visible crew/equipment: In the last scene of the movie where Mike and Marcus are both in Marcus's "new" pool, as soon as the pool collapses into the ocean, you can see in the background a crew member standing there as if he was there to "break" the pool and in a quick shot back to where the pool was, he is gone.
Continuity mistake: In the "white power vs. blue power" scene when Mike yells "Marcus!", he fires both his Glocks. But in the following slow-motion shot, the bullet from the gun in his left hand is nowhere to be seen, although you can see he fires them in the same direction. In fact it probably would have hit Marcus, while the bullet from Mike's right-hand gun scrapes him in the bottom-cheek.
Continuity mistake: When Mike and Marcus are running from the Miami Bank in pursuit of one of the bad guys, Mike's pant leg rises and you see he has on white socks. In the next scene the bad guy and Mike are struggling on a train, once again Mike's pant leg rises, but this time he has on black socks.
Visible crew/equipment: When Mike and Marcus are shooting in the pink house, just before Mike is about to throw a gas canister in the room behind the door, look carefully at the tilted mirror on the wall opposite. You can see a crew member kneeling down to get something and then coming back up.
Factual error: When the guys pop out of the tunnel and start shooting at the guards it shows bullets going into the pool making big splashes. At the angle they were shooting from the bullets would barely skim the water making very little splash if they even went into the pool at all. If these were true ex-Deltas they would most likely have a little better aim than just spewing a line of bullets until they hit someone.
Factual error: During a shootout in a house of the white-dredded Haitian, there is a moment when Will Smith shoots the bad guy right in the eye. Camera enters the barrel of his gloch, and everybody can see the regular cylinder barrel with grooves. But barrels of glochs always have polygonal rifling visually barrel channel is hexagonal, not cylindrical.
Deliberate mistake: During the car chase in the Cadillac, the van being chased crashes through a concrete block wall. Even if you can look past the unlikelihood that the van would even be drivable after going through, it is impossible that it would come through without any damage. Surely the windshield would be cracked, the headlights broken, etc. This was obviously not done with a real brick wall and they didn't think to damage the van before running it through the wall. They do show a dent and a messed up grill in a closeup later, but the damage doesn't match the wall scene.