First lets talk about what matched. One thing is how Julian is still very rude like when he gives notes. Second Thing is how Daisy died. Third is how the dad is funny like when he said "Oh, it's in my office". When they talk about Auggie's helmet. These are things they have in common.
Next, let's consider the areas where the movie did not follow the book. One thing is how Auggie doesn’t have hearing aids. Thought that this was a very important part of the book, as it was lost in the fight. Also another thing is how the movie is The Wizard of Oz, instead of The Sound of Music at the nature reserve. This is why Auggie did not state the wizard of oz is Auggies favorite. One big change is how auggie keeps his helmet till he goes to school. This part is very important because we learn that his dad, Nate, took it. In the book he threw it out, but in the movie he kept it in his office! That is not a minor change.
Overall, I thought that both was amazing. But as always, the book was better than the movie.