Headscratchers / Pierrot le Fou

• When Ferdinand and Marian decide to fake their deaths by setting their car on fire alongside a crashed car with two dead passengers, they didn't think that the police could suspect something if they saw that there was another car with no passengers behind their "car" nor why one of the passengers was laying dead out of the car reclining on the unfinished bridge's column with one of the doors?
• At the end, when Ferdinand ultimately regrets his decision to kill himself to no avail as the dynamite gets blown up, why, instead of fruitlessly trying to extinguish the fuse, he didn't just pull the sticks of dynamite from his head, throw them away and run as far as he could? The little time he had left could have been used to do exactly that!