In Hullabaloo in the Guava Orchard, do they talk a lot about the caste system?
The caste system is only actually mentioned once in this book, and this comes as a memory of Sampath's education, in which, typically, he did not distinguish himself. In Chapter 5, as the wedding goes on, Sampath takes himself away to a room where all the bridal silks and jewellry is. As he plays with them and enjoys the quietness of the room, he remembers how he used to have to spend so long at night revising and preparing for tests which was ultimately a futile thing to do as he knew he would never get good marks:
The next day, he had known, he would leave blanks instead of answers to the questions chalked up on the blackboard--the ten most important political reforms introduced by King Asoka, the advantages and disadvantages of the caste system.
Thus the caste system is only mentioned in this novel in the context of Sampath's schooling, which is a dim and distant memory that he has done everything he can to forget and to move on from. It is clear therefore from this one mention of the word "caste" that it is not a central theme in this excellent and hilarious story.