Do holes exist? Or are they pockets of nonexistence?

There's a fun paper by David and Stephanie Lewis on this question. You can find it in the first volume of Lewis's Philosophical Papers or at this link.

And there's a fun book by Roberto Casati & Achille Varzi, Holes and Other Superficialities (MIT Press, 1995).

Read another response by Cheryl Chen, William Rapaport
Read another response about Existence