The airplane departed on a local sight-seeing flight at Lower Lake, California. A noncurrent commercial pilot was flying the airplane; the PIC, a current commercial pilot, was occupying the right front seat. The airplane collided with some 12-foot high manzanita bushes about 1/4 mile southeast of the runway threshold while on final approach to runway 30. The pilot flying the airplane reported that the PIC pulled off the power while on final approach and the airplane crashed; the right rear seat passenger confirmed the pilot's statement. The PIC reported that he was not the PIC and that he did not know the commercial pilot was not current. The PIC owns the airplane. The PIC further reported that when on final approach the airplane was too low and he advised the pilot accordingly. He then took control of the airplane and during the interval the airplane lost 100 feet of altitude and collided with the high manzanita bushes.