Revealing mistake: Pretty much throughout the whole show, the iron prison doors do not have any way to lock. Guards put the key in, but there is no actual lock or latch on either side of the door. Even when these doors are pushed shut, there is not a locking sound.
Oz (1997)
1 revealing mistake in show generally - chronological order
Starring: J.K. Simmons, Ernie Hudson, Terry Kinney
Visible crew/equipment: While Jefferson and Kareem are talking alone in the stairwell, just as Jefferson confides, "It's just that I feel so bad and so ashamed of everything I did before," the blue-sleeved arm of a crew member is visible at the right side of the screen. (00:33:25)
Augustus Hill: OZ. The name on the street for the Oswald State Correctional Facility, Level 4.