Originally Posted by VelvetElvis
The frustrating part is that when viewing the source, there's no characters showing that I can replace. As mentioned, "I've" becomes "Ive" when viewing the source. The Sony is the only thing that knows there's an apostrophe there. Unfortunately, it shows it as a question mark.
An ePub file is just a zipped HTML book with some special control files added. Since the Sony knows there is a character there it must be present in the ePub file at that point. You could therefore use the 'Tweak Epub facility in Calibre to get at the HTML inside the ePub to examine (and possibly correct) the issue.