Continuity mistake: When the Captain slashes the elderly inmate's face with an object, the elderly inmate falls over and his left hand is covered in blood. Seconds later, just after the guard walks out of the room after asking what happened, a large amount of the blood on the elderly inmate's hand has disappeared. (00:08:17)
Continuity mistake: When the two prison guards discover that there is metal inside Ricky's chest, they begin pushing him over to the X-ray machine. The guard holding a baton is shown pushing the bottom of the baton against Ricky's upper back, but in the next shot, he's suddenly pressing the entirety of the baton against Ricky's back. (00:05:39)
Continuity mistake: When Ricky is being inspected for metal by the two prison guards, he opens his shirt so to reveal his chest. His right nipple (or left from the viewer's POV) is exposed, but in a close-up shot of his chest, the nipple is suddenly covered by his shirt. (00:05:28)
Visible crew/equipment: Just after the police bus pulls over inside the prison, the camera moves forwards towards the side of the bus towards the front whilst one of the guards goes to open the bus door. When the guard walks around the driver side just before reaching the door to open it for the prisoners, the reflection of the camera crew can be seen reflected on the side of the bus. (00:03:10)
Visible crew/equipment: During the headstone smashing scene, there is a moment right after breaking one with his back, where Ricky does a backflip and destroys a headstone being thrown in the air, and the hand of a crew member can be seen momentarily to the right of shot when it is thrown at him. (00:21:28)
Revealing mistake: When Wong Chun cuts the skin off Sa's lower face, in the close-up shot of his face getting skinned, it is apparent that Sa has been replaced with a dummy. (00:45:50)
