Includes important messages for kids, particularly about how it's wrong to make fun of someone because of the way they look. Our differences are what make us special, the mouse teaches Dumbo. Mrs. Jumbo's actions prove a mother's love is unconditional, and she will defend you no matter what. Themes include courage and empathy.
Nothing in the movie itself, but many offline merchandising tie-ins.
The clowns, who are shown in silhouette, are obviously drinking. Dumbo and his mouse friend Timothy accidentally get drunk after drinking what they think is water. While drunk, Dumbo has an elaborate (and creepy to some kids) hallucination with the infamously trippy "Pink Elephants on Parade" sequence.