There are positive messages about the importance of scientific discovery, in particular paleontology. Kids will learn how "every fossil tells a story," and why that story is pivotal to understanding the past.
Younger or more sensitive kids may be scared at several points throughout the film. Dinosaurs are killed (although it's shown off camera) by other dinosaurs. The leader of the herd brings all of the dinosaurs onto a frozen lake that breaks causing a few of them to fall through and drown. Fire erupts and consumes the dinosaur's habitat. As a young dinosaur, Patchi is nearly killed, and he's permanently disfigured by a carnivore that bites a chunk out of his frill. Male dinosaurs fight for dominance of the herd. Predators attack the Pachyrhinosaurus several times, and there are many close calls.
Patchi sees Juniper and instantly falls in love (a Barry White song plays in the background). He hopes to be her mate but it's implied that his brother, who becomes the herd leader, has the "right" to be with her.
A few insults like "stupid" and "coward" and "runt." Plus some poop talk.