An American CrimeGoofs
(at around 1 min) When Gertrude Baniszewski burns Sylvia Likens with a cigarette on the top of her hand, Sylvia screams (flash to outside) the view from the outside of the house shows a fan in the front window of the house then, Sylvia screams again and the next view from outside the house there is no fan in the window.
Errors in geography
In the film, Gertrude's youngest child is called Kenny, and his father is named Andy. In reality, the father's name was Dennis Wright, and his son was Dennis "Denny" Wright, Jr. It is possible both names were changed out of respect for the real Dennis Wright, Jr., who was an infant during the crime and who, at the time of filming, was still alive.