In the scene at a closed gas station when the suspended agents confront Lamar in his car, they let gas from a pump inisde where he is sitting before they have the car explode. When gas stations are closed, the pumps are normally turned off from the inside so no gas can be taken without paying for it.
When Roy is leaving the airport with the wrong red bag, an airport worker tells him that his stubs don't match. Daryl, who left with the wrong red bag just before, should have also been told that his stubs don't match, but obviously wasn't which is obviously a ploy to set the plot in motion.