Here's a List of the Books Mentioned on Dash & Lily and Their Significance

The most mentioned book throughout the series is From the Mixed-Up Files of Mrs. Basil E. Frankweiler by E.L. Konigsburg. This is a story about two younger siblings who decide to run away to live in a museum. Lily refers to her great aunt Lillian as "Mrs. Basil E," who is her self-proclaimed fairy godmother. There's also a museum scene near the end of the series that brings Dash to a major realization.