Continuity mistake: DMX uses his Porsche to slide a dumpster into the vehicle following him, staying in contact right up to the impact, so by rights the back of his car ought to be wrecked, but in all the scenes afterwards when we see his Porsche, it doesn't have a scratch on it.
Plot hole: When the "black diamond" is being turned into its dangerous form, the arms dealers get very excited. Yet all they actually see is a very pretty laser show. There is nothing to show that the object really has any destructive power. Arms dealers make their fortunes by being cautious and smart. They shouldn't be so quick to accept the claims of the bad guy and bid money on possibly useless stones.
Other mistake: When Tommy and Archie are in the tank keeping the arms dealers distracted, Tommy turns his head to see what the noise he heard is(Vanessa breaking out of the van), allowing the laser technician to get behind a dual .50cal machine gun. However, it takes about 25 seconds for the laser technician to get to the gun and for Tommy to look at him. Tommy should have only glanced at the noise, but instead he looks and stares at it for a long time - 25 seconds. He would have easily seen and heard the technician going for the .50cal and had 25 seconds to pull the trigger and kill him.
Continuity mistake: When Fait goes to see Jump in prison, you see Fait almost go after him when he tells Fait to make another little girl. Jump is sitting in his chair and he brings his cigar up to his mouth when he says "Drama". The camera angle changes and the cigar is no longer near his mouth. The camera angle changes again and the cigar is back in front of his mouth.
Continuity mistake: When Fait's daughter gets the key to the van, she drives the van in the warehouse crashing into a number of items and you see the front of the van getting damaged. When we see the front of the van again right after Jump gets killed in prison, the front of the van shows no damage.
Visible crew/equipment: When Fait is being chased through an alley, a motorbike jumps over some boxes and a van. We can see the ramp which the motorbike jumps from at least two times. First from an above shot when the motorbike jumps, and from inside a police car when it stops right in front of it. This ramp wasn't visible when Fait drove by.
Continuity mistake: When Ling is trying to escape from the aircraft hanger in the helicopter, the helicopter loses stability and he sees Su hanging on the landing gear and you see the landing gear start to raise. Then in the next shot he tells the pilot to raise the landing gear and you see the landing gear start to raise again.
Continuity mistake: When Fait spots the Navigator following him, he speeds up in his car weaving in and out of traffic. He comes up to a mini van in the right hand lane and then goes into the left lane where you see a side panel van about 20 feet in front of him in the left lane. The camera angle changes and the left hand lane is now seen with no cars in it, which allows him to speed up even more.