The landing of this big Grumman Goose ended in a spectacular accident

What happens in this video ?

The landing of this big Grumman Goose ended in a spectacular accident.
The plane was supposed to land on a river at Tamarindo (Costa Rica) for a sequence of the movie "Endless Summer II". After landing, the right pontoon caught the water, and jerked the aircraft to the right. Overcorrecting, the pilot put the left float into the water, and the aircraft swerved to that side. He applied full take-off power to get the aircraft back into the air, but it careered from the river onto the beach, where it ground-looped and came to a stop. No one was injured.