You have to be careful with filenames with ' in them. There are actually two different kinds, but depending on the viewer, they may look the same. One is a straight tick, while the other one is curved. One works fine while the other does not. I can't remember which is which, so I play it safe by stripping both of them from the filename before copying the file over.
Another character is '!'. It can scan and add the book to the database fine, but it'll throw an error if you try to open it (at least, it does with kepubs; not sure about regular epubs). It seems dumb that it can import the file fine but can't open it, but I can't figure out if it's a bug or a known issue.
In either event, if you use Calibre to send books to your device, it automatically strips out those problematic characters during the transfer. I wish it did the same when saving to disk; it would save me a lot of headaches.
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