During the final fight sequence, Donnie's shoes change from boots to sneakers in several shots.
In the final fight Donnie Yen kicks Sammo Hung on to the bar. Sammo bounces off it, seemingly falling to the floor. But in the next shot, Sammo is standing up against the bar. The shot after it he is even lying on it, when Donnie does an acrobatic move to crush him into the glass holder.
During the final fight, Wong Po's phone changes model. When he is talking to his wife, Donnie kicks and he falls. The phone drops to the floor. In the next shot it appears again, it's a different model.
Even if Wong Po was not the trigger man, his participation in beating a cop would at least make him an accessory to murder, which would allow the police to arrest him, and make tampering with evidence unnecessary.
When Jacky Wu fights Simon Yam in the end Jacky throws a knife in Yam's hand. No blood appears and the hand bends like a rubber hand.
Despite taking place in the late-1990s, there are ads for Apple's 2004 iPod.
Despite taking place in the late-1990s, Donnie Yen plays The King of Fighters 2002: Challenge to Ultimate Battle (2002), first released in 2002.
Simon and his gang of members were on their way to the crime scene when a police undercover was murdered and crossed path with a geek that had apparently videotaped the murder. He was not detained at all despite holding a video-cam in his hand and the guys just let him walked away. The next thing you know that same geek turned up at the police station.