During the Triad assault on James Chan's house, Sean Kane attacks a Triad terrorist who knocks an ornamental box off a desk as he falls. When Kane runs for the door, the box is back on the desk again.
When Kane carries Heather's tapes in the TV studio, the order of the tapes changes from shot to another.
When Kane is at the mansion in the finale there are two limousines parked in front of the home, 3/4 of the way though this fight finale the two limo's explode, blown sky high and completely engulfed in flames, 2 minutes later there is a scene again in the front of the mansion and the two limo's are back to their original unexploded condition.
At the raid on Canfield's house, Capt. Stevens has an automatic pistol in his holster, but the ammo pouch on his gun belt is for revolver ammunition.
There is no way Kane could afford the luxuries of his personal lifestyle on a cop's salary. (It was never stated that he inherited any money.)
When Heather views the tape to Kane in the TV studio, she keeps on running the control/effects panel by pushing buttons in a random way that makes no actual sense.
When the gunman is strafing the patio, they tear up a lot of ground, but completely miss the glass table...even after hitting the centerpiece on the table.