In the brief time while Salvo is calling the authorities to come and dispose of the body of the horse, a truck comes along the beach and takes it away. But there is only one set of tyre tracks, which are supposedly of the truck departing, No tracks made by its arrival.
It is also surprising that Salvo did not hear the truck, as he was standing not far inside his wide open front windows making that call, only perhaps 20 metres from the dead horse.
The illegal races, supposedly only conducted by night, take place at a time when the shadows show the sun is high.