Horton's two mottos are important life lessons: "A person's a person no matter how small," and "an elephant's word is 100 percent." Themes include compassion and integrity.
The Kangaroo offers a few mild insults about Horton's behavior. A little mild potty humor. Insults such as "boob," "idiot," and "stupid."
Nothing in the film itself, but there are multiple merchandise tie-ins with IHOP, events at Target, contests in newspapers, etc.