The films kept the same feeling that one would get from reading the novel. A Hobbit on his adventure, there and back again. Though they kept the same feeling, scenes and characters occurred even though they were never included in the novel. Tauriel was a she-elf that created a love triangle between Kili and Legolas. In the book, Kili goes with the other dwarves, entering Smaug’s lair. In the film, he gets a injured in the leg by an arrow that becomes infected and he’s forced to stay in Laketown with Bard and the others, and Tauriel and Fili his brother.
Their deaths will become different from the original story. Also the size of Smaug became enormous compared to the book and J. R. R. Tolkien had his own artwork of the rough size of this dragon and the amount of gold he settled in. The treasure and how much dragon remained under the mountain was blown off the scale. These differences hardly impact the plot, but those are some differences between The Hobbit novel and The Hobbit movies.