How does the author use wordplay in the novel, Undermajordomo Minor?

The author often uses wordplay to comic effect. When Mr. Olderglough, for example, gives Lucy the title of undermajordomo, and Lucy’s last name is Minor so that the title can be Undermajordomo Minor (DeWitt’s first book is called the Sisters Brothers, and is about a group of brothers with the last name Sisters). Lucy jokes with Mr. Olderglough about whether or not a one-sided corresponded is not a grammatical absurdity.