Jonas experiences warfare on page 120 in chapter 15. "From the distance, Jonas could hear the thud of cannons. overwhelmed by all the pain, he lay there in the fearsome stench for hours, listened to the men and animals die, and learned what warfare meant." The play did not change it in a good effective way because it did not turn to be good. And it did not reflect how the actual book went.
This event occurs on page 57 chapter 7. This is when Jonas realizes that the chief has skipped him. "A mistake. She made a mistake. But Jonas knew, even as he had thought, that she hadn't. the chief elder made no mistakes. Not at the ceremony of twelve." The scene from the play was not effective because it did not show how it went .
Gabriel gets injected with a needle and has been confirmed for elsewhere because he was different from other children. "he pushed the plunger very slowly, injecting the liquid into the scalp vein until the syringe until it was empty." this is located on page 149 chapter 19. The play did not show how it went in the book or the movie because it was not effective.