Continuity: At the dedication of Buddy Deeds' plaque, it is supposed to be midday (Pilar says she is on lunch break), but long shadows are visible. A few minutes later, by the river, the sun is back overhead.
Continuity: In the bar, the head of the beer in the jug in the background repeatedly changes size between shots.
Factual errors: Sheriff Charlie Wade is armed with a Colt 'New Frontier' revolver, first introduced in 1961 by Colt as an updated version of the old Colt 'Peacemaker'. The events in the film take place in 1957 and 1958.
Factual errors: When Pvt Johnson is told she failed the drug test, the rank on her hat is upside down.
Revealing mistakes: When Col. Payne enters Big O's bar, the birds (Eagles denoting full colonel rank) on his shoulders are upside down.
Errors made by characters (possibly deliberate errors by the filmmakers): A woman mentions that a high school football player runs the 40-yard dash in 3.4 seconds. This is highly unlikely, as most of the records for the fastest 40-yard dash are around 4 seconds flat.