The shot of Julot's Volvo driving down the mountain freezes for an instant before the explosion, which supposedly comes from beneath the car, goes off. It is obvious that the fireball is superimposed over the shot and that the car was untouched.
When Txema and Koldo are fighting near the explosives dump, in one shot of them rolling on the ground a crew member's legs can be seen at the top left of screen. The crewman quickly jumps out of the way as the camera pans towards him.