When the injured worker is being loaded into the ambulance, you will notice the outline of half of the state of Georgia (not Mississippi) on the rear door. As it leaves the area you will also notice the side logos are blanked out. This is because they were using vehicles from the filming location in Covington, Georgia. Later in the series, as the budget increased, they corrected this goof by having a Mississippi state outline instead (on the rear and sides).
When Virgil and Bubba pull up in front of the prostitute's house, the weather is sunny and clear. A few minutes later, when driving to the scene of Red Cahills's murder, it is overcast and snowing.