Now THAT is some up close and personal service!
Down here at the bottom of Arizona, we have occasion to see slurry or water drop fire-fighter flying. Where I am, most forest fires are in mountain woodlands - the flatter desert areas don't support tall trees. Result, the P2Vs and Cessna monoplane duster craft dump from somewhat greater alt above the burning ravines and valleys. Also locally, ground is near 5000' above MSL - air is thinner, but the turbulence is as strong as at sea level. Requires further caution. A former neighbor, a multi-engine instructor, moved back to Iowa because even without fire-updraft turbulence, the air out here is too nasty to enjoy. And as a multi-engine instructor, he was often called on to fly the gauntlet, in non-liquid-dropper light twins, to give a PiRep to the tankers...
A P2V tossing pink in a bank a few hundred feet above a fireline is a memorable sight. I just wish we could treasure that sight in memory only, not frequently repeated in nearby skies... Years back, we had occasional B-17 commercial converts(!), and I think a few C-130As. Those tended to break up, as it was the later marks that had the reinforced wings... and fewer flight cycles...
re: the film - I believe the flying was in Spain, by a Spanish Ejercita (Emergency) unit. The aircraft looked like a Canadair design about 20 years in service. Any info on actual mfr, designation and deployment?