In the club, Dorinda, after changing into her new white dress says, "If you want to dance with this dress, you have to wash your hands." The firefighters wash and dry their hands and as they leave the bathroom, their shirts are still dirty, but when they are dancing with Dorinda, their shirts are clean.
When Dorinda rides her bike onto the airstrip to tell Pete that she loves him before he takes off, she jumps off her bicycle in front of the port engine and it isn't running. She climbs up on the plane to the cockpit scene but when she climbs down to her bicycle the engine is running and Pete is still on his feet in the cockpit so he couldn't have started the engine that fast. It was the reason she couldn't hear him saying "I love you".
After Al gets covered in red fire retardant and is yelling at the pilots, his neck miraculously gets clean and his shirt dries out.
Pete puts out the fire in Al's port engine and the propeller can be seen coming to a halt. In the next scene, the propeller is spinning again.
When Al is in Flat Rock he shakes the hand of Ted Baker and gets grease all over his hand. He then gets the grease under his nose but the amount of grease changes more than once.
The Douglass A-26 Invader Air Tanker is powered by two 2,000 HP engines and empty, weighs about 23,000 Lbs. When it drops its 1200 gallons of fire retardant, it suddenly loses almost 11,000 Lbs. There should be no problem in getting the plane to climb after the drop. In fact, after a drop, keeping the plane from climbing too fast can be a problem.
After a successful retardant drop, a tanker pilot lands at the tanker base and taxis to a stop. His plane is surrounded by cheering firefighters who appear to have been working on the fire as their fire clothes are dirty and they are holding firefighting tools. Real firefighters wouldn't be hanging around a tanker base after being out on the fireline, and if they were they would not be allowed to swarm a plane on the taxi way - too much chance of someone getting cut up by a propeller or run over by a plane.
At the climax of the film, a group of endangered smokejumpers is supposedly making their way to a river and safety. However, they are clearly moving uphill. You move uphill to get to a ridge (a fairly safe place to be in a wildfire); you move downhill to get to a river.
When Ted gives CPR to the bus driver, he is clearly pretending to perform chest compressions and breathe into him.
Doing real compressions on a beating heart can actually cause the heart to stop.
As Al puts his parasol into the ground, he sits directly under it, although the shadow is about five meters behind him since the sun is quite low.
When Pete begins his dive to put out the fire in Al's aircraft he first retards the throttles, the correct procedure to start a dive like that, but you hear the engine RPM increase at the same time. After entering the dive the engine RPM would increase due to aerodynamic effects on the propellers, but this would only begin after entering the dive not while still in level flight.