The incident where Dorinda mistakes Ted's John Wayne imitation as Henry Fonda actually occurred between Holly Hunter and Brad Johnson during filming. Steven Spielberg found the incident so comical that he reproduced this in the final movie.
Audrey Hepburn had to be carried on a stretcher by crew members when shooting her scenes in the burned-out forest so that the dirt and ashes wouldn't smudge her white costume. The sweater and slacks Hepburn wears were from her own, personal wardrobe.
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.
After Ted Baker flies back to Colorado to get his tack card, he follows right behind the taxi car called "Follow Me" but it was unmanned and out of control and crashed into Derinda's house. Baker stops his Citabria right before the crash, when he instantly hops out of the plane the engine is already off and the propeller is stopped.
When Dorinda leaves the plane after she tells Pete she loves him, she can't hear him over the planes engine, but in the climax of the movie when she takes the plane out to clear a path for the smoke jumpers, they converse over the roar of the engine with only a dull yell.
Al Yackey: I miss him too! I miss him too. I miss him every day. I loved him like I've never loved a guy. And I don't love guys. You don't have an excuse, you quit. You quit, you gave up. He never quit on anything 'til it killed him, and that was his way, and there's much worse ways, and boy you sure found one.