Factual error: At the road block scene, the state trooper is wearing brown boots with his uniform. There's not a state trooper in Texas that wears brown boots in uniform. Black trooper boots are part of the Texas State Trooper uniform.
Factual error: A few issues related to the portrayal of Texas state troopers in the film. Most obviously, the patch worn on their uniforms is an anachronism, as that style has not been used since the 1990s and the film is set in the present day. There are also some smaller issues related to their vehicles - for example, the graphics and lights are slightly different from the real things, and the license plate numbers are inconsistent with the style used for actual highway patrol vehicles.
Answer: When they bought the car they told the store owner not to report it stolen until Friday.