James Cagney had been in a dispute with Warner Brothers since 1936. In 1938 the situation was resolved, and Cagney returned to his home studio - to do THIS? It seemed like they were punishing him for the entire episode, but his autobiography mentions only that he was glad to team with his two pals O'Brien and Bellamy. He does admit that he never deliberately watched his own movies though, and only saw this one on TV after he retired.
James Cagney and Pat O'Brien are two Hollywood writers tasked by their studio with coming up with a script for the studio's top Western star, with Dick Foran basically doing a parody of himself in just about every role as a cowboy that he ever had. A waitress from the studio commissary brings up the writers' lunch and passes out. It turns out she is pregnant, and Cagney and O'Brien get the idea of making a baby central to Foran's next Western. In fact they make the waitress' baby a star. Everyone acts like this waitress invented the concept of infancy, because it never seems to occur to them that if something happened and this baby was unavailable that they could just go out and recruit another one. Marie Wilson plays the infant star's mother, and a little of her dumb and naive act goes a long way, in fact it goes too far and she is just annoying in short order. This was supposed to be a parody of Hollywood, but it was unfunny at best and tedious at its worst.
The first half is almost indescribably bad. It has everybody behaving hyperactively, talking so fast you can hardly understand them, and doing things that make no sense. It is exhibit A in everything that can go wrong in a comedy during the early years of the production code. This approach might have worked for the Marx Brothers, but it was - at the same time - chaotic and boring in this situation.
And then it's like a different director took over at the halfway point, everything calms down, and there's actually room for meaningful dialog, especially between Cagney and O'Brien. It's not particularly compelling, but if the entire film had been like the second half it would have been a respectable 6/10.
