I played more of the demo for Nancy Drew: Shadow at the Water's Edge! Sadly, I had technical difficulties where the sound skipped randomly, so I had to throw out ten minutes of footage and replay that part of the game. So if it ever looks like I know what to do ahead of time, that's why.
I still don't know how to do the last thing on my to-do list: find out what a yurei is. I mentioned this about five times, so people who have actually beaten the demo can give me a helpful hint.