In the botched execution scene violence is actually quite tame, however it is still very disturbing. In this scene there is no visible blood.
Quite a few executions by electric chair. One is botched.
An inmate attempts to kill a prison guard by strangulation. He kicks other guards in the process. One guard intervenes before the inmate kills anyone.
A man spits a chewed up moon pie in another man's face and compares the results as that of blackface.
Due to a purposefully botched setup, an inmate being executed in the electric chair is zapped for a long time. His body convulses, and flames erupt on his body and under his death hood as he screams. The scene lasts several minutes.
A man cradles the bodies of two dead girls, their hair matted with blood. Their father bloodlessly punches him across the face a few times before he is pulled away.
An antagonist is shot in the chest, some blood and bullet wounds appear on his shirt as he slumps down dead.
A prisoner elbows one guard and chokes another with handcuffs (a bit of blood spurts from his mouth) before bashing his head on the wall, a bit of blood is on their faces. He then kicks an incoming guard in the crotch before another one hits the prisoner twice, knocking him out.
A mouse is purposely smashed by a shoe, we see some blood around its head/face.
We see a bit of blood on a door and a small blood trail on a floor.
An antagonist hits a prisoner once on the fingers with a billy club, it's later brought up that three of them were broken as a result.
A few punches and a slap or two from angry guards towards an antagonist.