When Rogue is in his gun vault, he is loading a pistol magazine with his "depleted Uranium" rounds. The rounds are clearly 5.7x28mm, and the magazine is for a FN Five-seveN handgun. However, the gun he supposedly inserts it into is a Walther P99 in 9mm. This would be impossible because the Five-seveN-magazine is too big for the Walther.
During the Jason/"Rogue" car chase scene the same cars will appear on different roads. A black mustang can be seen going one direction, then the other, then be seen on a different road. A silver VW bug is seen start to finish during the whole "fast paced" scene.
At the Sayu Tea House after Crawford smashes his Chevelle into the fleeing Impala of the triads and the ensuing shoot-out he leaves his driver's door open. When Crawford returns to his Chevelle to start the chase scene with Rogue his driver's door is closed.
When Crawford maneuvers around the trolley during the chase scene with Rogue the front license plate of his Chevelle is missing. At all other times during the chase scene the front license plate is there.
After Tom/Rogue kills the original Rogue he removes his wedding ring and puts it on the dead Rogue. When he is washing up in the next flashback you can clearly see that he is still wearing his wedding ring.