In the scene where Paco's mother is packing her dead son's belongings away, Paco says to his mother "I have to do it!" It comes up as the same words on the screen twice. But when he says it the second time, he says something different in the language he is speaking.
When Mick and Horowitz are escaping and Mr. Daniels catches them doing it during recess, Mr. Wagner stands there with a blank look on his face as if nothing has happened, but immediately afterwards, he is with Mr. Daniels trying to capture the boys trying to escape.
When Horowitz swings Warden Bendix's golf club and breaks his green desk lamp, the next shot shows it unbroken.
In the final fight scene between Mick & Paco, Paco has Mick against the bunk, Mick is standing on the left of screen, while Paco is standing right of screen, and stabs him in his right shoulder. Then the camera cuts suddenly to both Mick and Paco in another fighting position, with Mick now on the right side, and Paco on the left, as if there was a cut in the film.
At the school lockers, Paco walks over with his books in his right hand, and he leans against the lockers with his left hand. When O'Brien turns around to see him, the books are in Paco's left hand and he is leaning on the lockers with his left shoulder. When O' Brien walks over, Paco has his books in his right hand again, and is leaning on the lockers with his left.
There was no reason a police lineup to be used for JC to identify Paco as her attacker. Police lineups are generally used when a victim can attempt to identify a suspect based on his or her physical characteristics, but doesn't know the suspect's identity, and she already knew who Paco was. Also, there was no reason for Paco to go through the lineup because officers arrested him at the time the crime had occurred.
Given that corrections officials were aware of their volatile history, there is no way that O'Brien and Moreno would have ever been confined in the same facility let alone in the same unit. Most likely, Moreno would have been held by the police until there was an opening in another facility.
When JC picks Moreno out of the police lineup, the criminals in the lineup are standing right in plain view of her. Crime victims are NEVER in the same room as the lineup. The criminals in the lineup would be in a separate room with a 1 way window.
Sean Penn's character gets some Yummy soda cans out of a soda vending machine. Yummy brand soda was only available in Jewel-Osco Drugstores and was never available in vending machines.
When Tweety is leaving jail in a van he's waving at the other inmates exercising. You can see him right beside Viking waving back at himself.
When Horowitz puts the "acid" on the fence, he only puts it on one side. When they escape, they kick out both sides of the fence.
Reason: as the inner fence is easily accessible from the facility's courtyard, Horowitz only needed to put corrosive on the outer fence during the jogging exercise.
The facility staff was able to determine that Horowitz planted the explosive device in the radio, which led to Lofgren being injured. The Warden said they identified the explosive and being made from nitrogen, so that's how they were able to figure it out. The same staff was unable to determine how Terrell was killed, or who killed him; otherwise, Tweety would not have been granted release, but his crime was untraceable, that's why he wasn't caught.
Obvious mannequin that Mick hits into when crashing the car.
Since the situation between Moreno and O'Brien was explosive, the administration had several actions they could have taken to keep them separated. At the very least, when Moreno's transfer came through they should have placed him in solitary until it was time for him to leave.
Position of Paco when leaning up against the locker.
When Terrell is killed by Tweety on the tier, shortly after Tweety has raped him, an autopsy would be ordered in reality. This autopsy would reveal that Terrell had been sexually assaulted prior to his death.
After Mick escapes from the facility and is recaptured, the staff gives him another chance. In reality, he would have additional charges (e.g. escape) filed on him, his sentence increased, and loss of numerous privileges.
The corrections officers in the unit demonstrate many unsafe practices throughout the movie, such as letting inmates get too close to them, or letting inmates walk behind them. In reality, the corrections officers would not allow this because that could easily subject them to violent attacks from the inmates.
Right before the fight between obrien, laufgren, and tweety, everyone was waiting to see it explode, including the CO wagner who was in the top balcany. But when obrian started beating the two, wagner was heard buzzing out of the cage, on the floor.
When Horowitz is going to solitary, his lips do not match what he's saying.
In the final fight between O'Brien and Moreno, a secondary camera man and crew member are seen completely in frame amongst the inmates.
In a fight scene near the climax, a member of crew (complete with camera).
When O'Brien and Horowitz are talking in the shower, the shadow of the boom mic moves back and forth on the wall when O'Brien walks away.
When the warden has Horowitz in his office to advise him that the remainder of his sentence will be spent in solitary confinement, Horowitz goes berserk and grabs one of the warden's golf clubs, destroying office furnishings in the process. Since a golf club could be used as a weapon, the warden should not have kept his clubs in the office within reach of an inmate. Also since Horowitz had previously rebelled against being confined to solitary, and had been implicated in a violent attack against another inmate, he should have been retrained in handcuffs while in the office, and another officer should have been present.
In the classroom when Mr. Daniels has Horowitz read the news story about Warren Jerome being killed after an armed robbery attempt, the class is uninterested in the article because no one knows who Warren Jerome is, except for Lofgren. After listening to the other inmates' snide comments, Lofgren angrily orders them to shut up, and lets the class know that Warren Jerome was Tweety. Considering how much inmates tend to know about each other, it seems odd that no one else knew that Tweety's real name was Warren Jerome.