When Darl is talking with Carla outside her house, the door of Carla's car changes from opened to closed several times.
When Scarlett is in the truck with Darl she uses an inhaler, typically used by those with asthma. She holds the inhaler incorrectly, the bottle must upside down with the nozzle pointing down connecting into the plastic mouthpiece.
Near the beginning, when the body is being examined, it breathes just before being covered up.
On the way to New Orleans the camera is visible in the window of Darl's truck.