Corrected entry: When Chris originally goes into the casino, he takes a 2x4 piece of wood, but in court, when he takes the wood marked "evidence" and says, "This is mine," it's a 2x2 piece of wood.
Corrected entry: The movie was based on the original Walking Tall trilogy made in the '70's. There are several notable scenes that mimic the original, such as the truck being torn apart, the big stick, and the blowing up of the hero's vehicle. Differences however include changes in names and locations. The original movie was the true story of Buford Pusser, who we see memorialized at the beginning of the credits.
Corrected entry: In the shotgun shootout near the end, the bad guy misses and shoots the laptop computer sitting on the desk. However the "shot" creates only a single hole on the screen of the laptop, hinting at a single special effects charge. At that range the shot would have definitely spread.
Corrected entry: Johnny Knoxville says to The Rock that he went 'down to Seattle,' establishing that they are north of it - a fact supported by the environment (trees, hill slopes, etc.). But later, when The Rock is elected Sheriff, the cars are labeled 'Kitsap County', which is west of Seattle and across the Puget Sound. Kitsap County also does not look like their surroundings - it is flatter, more urbanized, and contains two major Navy bases.