Factual error: In the scene when the police are heading to Clyde's house to arrest him, this tactic is highly unrealistic. In real life, when a person is simply a suspect in an investigation, the police do not all drive to the suspect location with lights and sirens going. This loses the element of surprise. They didn't even know if he was home, anyway.
Factual error: The co-ordinates given by Clyde Shelton: 39° 57' 4"N 75° 10' 22W as the place to find Mr. Reynolds, is the corner of 19th and Sansom Street in Center City (1919 Sansom, to be exact, which is an apartment complex), the downtown area of Philadelphia. The scene actually takes place underneath of the Betsy Ross Bridge, about 8 miles northeast of the coordinates.
Factual error: In the cemetery scene when the SUVs are leaving and the EMP knocks out electrical systems, the next thing you hear is walkie-talkie communucations between the vehicles. Those would've been knocked out, as well.
Factual error: During the lethal-injection scene, an executioner is plainly visible to the witnesses through a broad glass window in the death chamber. He is shown flipping toggle switches in-sequence to release the sodium thiopental, pancuronium bromide and potassium chloride that comprise the lethal drug cocktail. For one thing, in modern Western culture, an executioner is never visible to the witnesses. For another thing, there is no "executioner," per se, flipping toggle switches in the lethal-injection process. The component drugs are loaded into the death machine in advance, and it automatically releases the drugs via a pre-set timer.