Other mistake: Savage wore a long chain-linked necklace and Chaka wore an even wider chain-linked necklace. Inmates are not permitted to keep personal items that can be used as weapons or a means to commit suicide. (00:16:10 - 01:21:15)
Other mistake: It didn't make sense that the "fighters" were given protective gear (vests, boots, arm and elbow pads, etc.) if death was an expected outcome. Also, a private "for profit" prison is paid per number of inmates housed, so deaths in The Dungeon would reduce profits and would be avoided, not encouraged. (00:34:00)