Revealing mistake: At the gas station with the broken pump nozzle, Captain Stanley and the station attendant head to the garage area to see the main shut-off circuit box, which is located at the far right corner of the garage, but in the next shot, we can see the attendant's reflection behind Roy, and he's standing somewhere else off camera, not where he's supposed to be in the next shot with Captain Stanley.
Revealing mistake: At the gas station, when the pump sparks and catches fire, we can see that it's not gasoline on the ground with the water from the fire hose, but instead it's floating thick gobs of stunt fire gel with burning flames.
Answer: It is standard practice to wet down driveways so that they stand out in a long shot.
stiiggy