Barbie in the book is a short order cook wanderer type, ex military, who's leaving town as the book starts as he's run afoul of Junior and friends and gotten beaten up in a back alley (motive again some misplaced jealousy)---he's hitching and almost gets out. He hasn't killed anyone. On the other hand a lot of people know and like him because of his time working at the diner. The woman who owns the diner is also a major character.
The newspaper editor is a strong single woman whose dad and granddad ran the paper, a little older than Barbie, and has no husband for Barbie to kill.
The sheriff dies early from pacemaker problems, but he was a good guy--trying to expose the reason for the nefarious propane orders, not justifying him. Those justifications belong to other characters. His widow, another strong woman, plays an important role.
The radio guy is running a religious music station all by himself, for one of the local ministers. He's very weird from the first time you see him in the book.
The other main minister in town, is another strong woman, married to an EMT.
Junior kills his girlfriend very early on and puts her in a coat closet, where he visits her dead body and has sex periodically---no fall out shelter behind the house.
On the other hand the town hall does have a fall out shelter that plays an important role.
There are 3 teens, 2 boys and a girl, who play an important role, but later in the book than the teen who fell off the bike seems to be doing.
Junior's dad is also a bad guy, as in the movie, but he's positioned himself as the power behind the throne, behind a easily manipulated other man and with a kind of drugged out woman as the 3rd member of the council. The easily manipulated man was the husband of the woman killed in the plane (she was taking flying lessons). In the film he seems to be outside the dome, but in the book he played a major role.
There are tourists trapped in the town, but they are an older college prof and his nubile student girlfriend, who take over supervision of two fairly young tourist children whose mom left them to run into the neighboring town for groceries while they were staying in a cabin.
Cows play a role, in that a major character's family raises them, but I don't recall such a neat slicing!
Sooo, you can see, the dome is still there, but the cast is quite different! The visions of falling pink stars are in the book, too---so maybe they are keeping all the physical parts of the book!