Kinda. Oblio is made to feel bad about not having a pointed head when everyone else has a pointed head. He feels better about himself wearing a pointy hat, and while in exile, learns that he’s okay the way he is. The message might actually help some people with body image issues, but you should probably know going in that it deals with these themes.
No, but dementia is mentioned in an insulting way (saying a business tree who is eccentric “clearly has a case of dementia”). It’s brief but I did find that rather rude to people I know with dementia.
No slurs/hate speech or offensive content towards any (real life) group. There is some tension between characters with pointy heads and those without as an allegory for bigotry/prejudice.