The Junior stuff is getting irritating, and even accounting for the
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the fire felt like an arbitrary way to reach a climax.
At the same time, I get why they did it. Have a nice big group scene with all the mains, really establish the community, and then end with a pow. That gunshot at the end is a significant reworking of an important moment in the novel, and, yeah, the novel did it better. Doubling back on what Dreamdead said, a lot of that has to do with King's skill at immediate interior understanding of a character.
In the novel,
[a kid has a eureka moment and figures that a rifle bullet could permeate the Dome, because nobody's try to apply pressure in a concentrated manner (i.e. the plane crash covers a large surface area). So he drives up to the Dome, aims his rifle carefully, shoots, and the bullet ricochets off and plugs him in the face.
]
Stuff with Barbie went about as I expected. I predicted immediately after the first episode, on Reddit, that Julia's hubby was up to bad things, and Barbie would end up having shot the man in self-defense. And that's an obvious bit of prognostication, because it's CBS. They can't have a genuinely dark hero, so they'll have someone who's kinda emptily misunderstood.