- Awesome Music: The film's soundtrack by Masakatsu Takagi is one of its highlights. Sword in Your Heart is just one among many great tracks.
- Captain Obvious Reveal: Ichirouhiko being human, especially before the reveal. It is worrysome that he is so pale though.
- LGBT Fanbase: The titular Kemono, Kumatetsu, has some fanboys from the Furry Fandom, due to him being a muscled, badass literal bear. The fact he's a literal Bear might have helped.
- So Okay, It's Average: General consensus is that while the settings and animation are gorgeous, and Kumatetsu is an enjoyable character, the majority of the cast lacks depth or meaningful development, and the writing lacks much of the humor and realism that made Hosoda's prevous films so beloved. It is considered to be his weakest film.
- Tough Act to Follow: The film may be seen to suffer from this due to Wolf Children Ame and Yuki coming before it.
- Viewer Gender Confusion: Ichirouhiko, full stop.
YMMV / The Boy and the Beast