[Gorwingel]

I don't personally really think that he is more serious in the book than in the movie, but it is just that we have a lot more detail about the person himself. Pippin is a brilliant character in both the book and the fillm though. He is someone who seems like he is in a situation where everything is above him in the beginning, and then he finally begins to understand things by the end. He is mischivious, but none of it is ever on purpose, it is just his hobbit nature.

I think that Pippin was comical on purpose. The LOTR is a really dark story, and it did need some comic relief here and there. But it isn't obvious comic relief like we see in many of today's movies. It is there for a purpose, because most of the comic moments do cause someone to do something different changing the outcome of the situation to the better.