How does sedaris' selection of detail in the first paragraph establish a humorous tone in reference to david sedaris's "me talk pretty one day"

He brings tidbits of irony to his narrative, along with the character and circumstance that Sedaris creates.  For example, in the first paragraph, after establishing that he will again be a new student at the age of 41, he reveals all the benefits that come with a student ID: it allows him "a discounted entrance fee in movie theatres, puppet shows, and Festyland, a far-flung entertainment fee for the amusement park.

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.