When Cindy, at the Board of Pardons and Paroles, sends a fax to the court she puts it in the fax machine 'tail first'. Cut to the court and it is being received 'head first'.
During one of Elizabeth's visits to Cameron in prison, he states that his parents would never visit because it was a one-way trip from Oklahoma of 1200 miles. That is near double the actual mileage from anywhere in Oklahoma to Huntsville.
By saying in the movie description that he is executed is a major spoiler, and just ruins a good movie.
When the detectives are at Todd's house and are taking pictures of the crime scene, there are two posters of metal albums on the wall. One is the cover of the album 'Prevail' by Canadian death metal band Kataklysm, released in 2008, and the other is the cover of the album 'Abrahadabra' by Norwegian black metal band Dimmu Borgir, released in 2010, while the movie takes place in 1991.
Executioners are contract employees, not correctional officers. No department of corrections would allow an officer with daily contact with a death row inmate to "pull the switch" due to obvious potential for emotional attachments.