Also, take note that the Speedboat is using a dual jet drive, as opposed to a dual prop drive.
Jet drives on marine engines do not reverse the same way that propellers do; jet drives have a cover that the operator can control that covers the output nozzle to force the outgoing water to go back the other way, but not until it's already being spit out of the back of the drive. It can't completely shoot the water out the other direction.
Compared to propeller drives, jet drives are significantly less efficient in propulsion output, and you'll run higher RPMs to achieve the same kind of speeds as a prop drive. Their only main advantage is that they're easier to operate in shallow water.
The Speedboat is actually pretty accurate.