The combination entered on the keypad by Rogue to access his weapons locker forms the shape of a letter, which may have been intended as a clue to his true identity.
Jet Li stated in multiple interviews that he was not happy with this film nor its production. He went as far to say that this movie "sucked" and he had no confidence in director Philip G. Atwell. Even halfway into filming, he knew that it would receive mediocre ratings and not make profit.
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.
In the scene where Crawford is in the shooting range, there is a guy in the background who walks by, and then the same guy walks by in the same direction two seconds later.
As Jet Li enters the upstairs office of Shiro's showroom, the doors are opened by two employees. The sound you hear is of a latch and strike plate, neither of which were on the doors.