Revealing mistake: When Ricky punches the prison wall, the wall can be seen beginning to break apart a second before Ricky's fist hits it. (01:29:59)
Revealing mistake: When the Captain is tripped over by Ricky, his face lands on a plank of wood with nails sticking out of it. In the shot of his face getting impaled with the nails, we can see that the Captain has been replaced with a dummy. (00:08:50)
Revealing mistake: In the shot where Ricky punches the prison wall, a split-second before Ricky punches it, a faint outline can be seen to the right of him that gets blasted out of the wall a second later, revealing where the wall was filled in with fake debris and later plastered over. (01:29:59)
Revealing mistake: When the assistant warden explodes after his body starts inflating due to the warden shooting him with the elephant bullets, in the close-up shot of his head exploding, we can see that his head has been replaced with a fake dummy head. (01:23:18)
Revealing mistake: Just after the warden has shot the assistant warden with the bullet made for shooting elephants, there is a shot of the assistant warden's body inflating. In the shot, we can see that really bad prosthetics have been added to his forehead, cheeks, nose and chin to make it appear as if his head is inflating. It is extremely noticeable where the prosthetics end and where his real face begins, making the whole effect appear completely unnatural. (01:23:12)
Revealing mistake: When Ricky attempts to fight the muscular warden, he punches the warden in the stomach and the warden then punches him into a support column. Just before Ricky crashes into the column, a wire can be seen attached to him, pulling him backwards towards the column. (01:27:20)
Revealing mistake: When the warden shoots White God, the close-up shot of his face before he explodes reveals that the actor has been replaced with a dummy. (01:25:55)
Revealing mistake: When the assistant warden and the bald inmate walk into Ricky's cell after not seeing him inside, Ricky reveals himself, grabs onto the bald inmate and punches part of his head off his body, killing him. In the shot where Ricky punches the inmate in the side of the head, we can see that the actor has been replaced with a dummy. (01:19:17)
Revealing mistake: When a couple of the inmates are watching the assistant warden drag Fa out of his cell by sticking his hook hand into his mouth, it is apparent that the man being dragged by the hook hand is a fake motionless prop dummy and not an actual person. (01:18:36)
Revealing mistake: When Ricky's girlfriend commits suicide by jumping off the roof of a drug dealer's apartment building, the body that is shown falling to the ground is a dummy and not a human body. (01:11:28)
Revealing mistake: When the gang of Four show Sa the dead body of Hai lying on the bed, the body shown on the bed is a fake dummy body and not a real human body. (00:45:22)
Revealing mistake: When Sa shows Ricky that his tongue has been cut out, in the close-up shot of his mouth, it is apparent that his mouth has been replaced with a fake prop mouth. The skin, lips and teeth do not resemble how human skin, lips and teeth appear in any way. (00:42:02)
Revealing mistake: When Ricky punches Hai after throwing him into the air, there is an X-ray image shown of Hai getting his skull pummelled in. In the shot after this, Hai can be seen swinging backwards unnaturally, revealing that he is being held up by a wire off-screen. (00:38:05)
Revealing mistake: In the close-up shot of Hai's stomach when he removes his intestines, it is apparent that the blood that was used is not real blood, but in fact red-coloured water. The blood shown here does not have the thickness that real blood has and drips way too much like water. (00:37:41)
Revealing mistake: When Hai jumps down from the cross, Kuang's body, that has been attached to the cross, is a dummy and not a human body. (00:34:37)
Revealing mistake: When the assistant warden stabs Ricky in the hand with his metal hook hand, in the close-up shots of Ricky's hand, it is apparent that Ricky's hand has been replaced with a fake dummy hand. (00:25:08)
Revealing mistake: When the elderly inmate is telling the two prison guards he wants to go home to see his wife and kids, one of the guards kicks him, and he falls back, but the kick misses the inmate by a few inches. (00:11:50)
Revealing mistake: When the elderly inmate is pushed over by the other prisoners, a wooden train he made falls out of his clothing. It can be noticed that the man is just holding the train in his hand whilst falling and drops it when he lands on the ground to make it appear as if it fell out of his clothing. He was not meant to be holding the train as it was not shown being held in his hand at any previous point. (00:07:25)
Revealing mistake: When the warden has finished shoving the inmate's arm into the meat grinder, there is a shot of the warden pulling the inmate away from the grinder and showing him the tray of meat made from his arm. In the shot, we can see that the inmate's face has been covered in white powder to make him appear as if his face has gone pale due to the blood loss, but it makes his face look completely unnatural, and not at all how a human face would ever appear in a situation like that. (01:22:09)
Revealing mistake: Whilst the cell is filling with cement, Ricky runs over to the steel door and bursts through it to escape. In the shot of him bursting through the door, we can see that the interior of the door is extremely thin and is barely a millimeter deep, revealing that it is a fake prop door and not steel. (00:53:45)
