(page 35)This is the scene where Jonas talks to his family unit about bathing Larissa. The morning after going to the House of the Old in his dream telling Jonas briefly mentions going to the House of the Old and bathing Larissa. This was a good change because the scene when Jonas bathes Larissa doesn't add to the main story.
(page 150)This scene is where Jonas's dad release the baby puts him in a box and sends him away. Both the book and the movie did this scene similarly and also when Jonas reacted in the play and in the movie he was very shocked
(page 179) Jonas sleds down the mountain and walks up to a nearby cabin. He goes up to it and the play ends. I think this change was effective because it doesn't leave such a big cliffhanger like in the book and it adds more to the main storyline by letting the reader know that Jonas maybe lives and there could be maybe another book.