There have been a few accidents over the years involving low flying over water whilst filming.
In crashes involving filming helicopters (or aircraft) hitting the water the camera operator has a higher fatality rate than pilot. On two occasions where the aircraft had a benign forced landing in water where all other occupants survived, cameramen have drowned due to inability to release their harness.
There are a few ways of reducing risks when shooting from a side door.
For instance, in respect to the boat video to get a shot of the starboard side of the boat they could have reduced the need for flying backwards by landing and moving the cameraman to the left hand seat.
Also the pilot's forward view, when crabbing to the left, was restricted by the front seat passenger, was he critical to the mission, could he in the back?
Helmets and vest style of life jackets are a help.
Mickjoebill