I'm not surprised. There are several of them, and they're mostly pretty confusing. Here are links to the various puzzles that ask you to do something with the headstones.

Scavenger hunt for the password to Jess's phone:

How do I learn the password to Jessalyn's phone?

Ethel's grave:

Where is Ethel's Grave, and why do I care?

Beauregard's headstone:

What do I do with the name "Beauregard"?

Franklin's memorial:

Where is Franklin's memorial, and what do I do with it?