The patch's on Sheriff Mooney's and his deputy's uniforms read "Mercer County Sheriff's Dept". But when Mooney is driving a sheriff's dept SUV, the decal on the door reads "Davis County Sheriff".
When Clay pushes the truck with the dead guy in it over the cliff, the truck eventually explodes in a huge fireball. But later, when the police investigate the incident, the truck is not charred by fire at all.
Shortly after the funeral, when Amanda is waiting for Clay in his bed, she gets up and a picture on the left-hand side of the headboard falls over. A few seconds later the picture is upright again.
Before Clay pushes the truck over the cliff, he's inside and he leaves the door open. But when the truck goes over the cliff, the door is closed.
The sheriff's badge has 6 points, but his SUV has a 7 point star on the door.