Although Rae is thrown in the dirt many times, her underwear stays perfectly white through out the ordeal.
Despite Rae running around in the dirt for much of the film in bare feet, her feet stay remarkably clean.
When Lazarus is singing in the bar towards the end of the film. The cable on the microphone he is using keeps switching from being wrapped around the microphone stand, to just falling straight to the floor.
The shape and location of the scar on Lazarus's right shoulder changes several times through out the film.
When Lazarus is entering the pharmacy he pulls a shirt over an obviously dirty tank underwear shirt with yellow staining at the front neckline. When he talks to the pharmacist moments later he's wearing the shirt, but his still-showing underwear shirt is pristine white.
To break her fever, Lazarus puts Rae in a bathtub, and fills it with ice. This is not safe, as it could cause hypothermia: having body temperature which is dangerously low. He should have put her in a regular bath, and just let the tub slowly cool down to room temperature. That would be enough to bring down her fever, safely.
The Flag Patch on the Battle Dress Utility (BDU) uniform is oriented correctly, facing to the rear when worn on the right shoulder, but it is a full color patch. The flag is worn on the right shoulder when American forces are engaged in coalition operations and on the left shoulder when American forces are operating alone. The flag on a BDU uniform is the usually the monochromatic (camouflage) patch. A color patch could allow enemy soldiers to target a soldier in battle.
Ronnie's American Flag patch on the right sleeve of his BDU shirt before he leaves appears to be backwards. However, this is in accordance with Army regulations that call for the flag to appear as if the wearer was advancing toward the battle; if the flag was reversed, it would appear that the colors were retreating. The unusual layout is due to the requirement to wear the flag on the right sleeve - the position of honor on the US Army uniform.
When Ronnie and Gill go back to Ronnie's house and everything is just as it was left some days ago, the lava lamp on the table has clearly not been on for very long.
When Ronnie & Rae are traveling down the highway in the old Caprice Classic, when the logging truck is beside them, the gear selector is still in the parked position.
The movie is said to take place in Mississippi but when they go to "town" the grocery store there has a Tennessee lottery booth in the background.
When Ronnie is talking with his friend Gill after returning from the Army, Gill calls him 'Ryan' instead of 'Ronnie'.