Doyle stops the crooks by emptying drums of highly inflammable Avgas and threatening them with a burning rag. But the drums are marked as containing oil.
The supposedly highly inflammable Avgas liquid poured out of the oil drums by Doyle is clearly water.
After dropping Galbraith off, as Galbraith and Cowley walk away, the helicopter lifts off again. A jet turbine powered helicopter in vision, internal combustion powered according to the sound track.
As Cowley is driven away, after saying "So, we're looking for a photographer first", the camera, the silver legs of the tripod, and the crew are visible as reflections in the rear quarter-light of the car.