Corrected entry: At the end of the movie when Jack drives the Mercedes in reverse you can hear him going trough the gears. There's only one reverse gear. There are no more gears.
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Correction: Indeed it only has one reverse gear, but what you're hearing is Jack getting on and off the throttle as he maneuvers the car backwards through the quarry. If he had just gone full speed he would have likely spun out or hit an obstacle prematurely.