Too Hot To Handle, starring Clark Gable and Myrna Loy. It also has Walter Pidgeon and Marjorie Main (Ma Kettle). Gable and Pidgeon play rival newsreel reporters. Gable in particular is not above creating his own news in order to get a good scoop. Myrna Loy plays an Amelia Earhart-esque aviatrix who is first a newsreel subject and then an employee of the newsreel company. Gable gets caught in too many lies and he loses the girl. Later, when she needs to be rescued from the Amazon, he gets her back.
Clark Gable and Myrna Loy had just enjoyed great success with an earlier movie named Test Pilot (also from 1938) and MGM was trying to keep the ball rolling.
One interesting thing: the movie is about newsreel reporters and in one scene they film a munitions ship that is on fire and eventually explodes. When later talking about this incident, the name of the ship is overdubbed in the dialog. What they end up saying (verified by closed captioning) is "Ilgrem Krest" as the name of the ship. I don't know what they originally said (Pilgrim's Crest?) but my guess is they changed the name to avoid a name that sounded too much like a real disaster. I can't turn up what this might have been. Nobody talking about this movie on the web seems to mention it. Frustrating.