The exterior diner scenes were filmed in the small town of Liberty, South Carolina. In real life, the diner is actually a wood shop and the $15/night hotel is actually a coin-operated washette.
When a close up of the rope is shown when Mason is letting "Elvis" down the dam it is blackened and sloppily wrapped quite different from the store; a moment later it shows Mason holding the rope up and, like at the store, it is clean and neatly wrapped.
When Officer Pappas is talking to Mason in Darlene's he places the cap on his coffee cup. The next time they show him the coffee cup has no lid and he grabs the lid to cover his coffee again