I'm running "97 Things a Project Manager Should Know" iPhone app (on a "New" iPad) - I got to chapter 12 and wanted to go back to the cover so I could show the book to someone else. In short - I can't.
I've managed to get back to the Preface (using the table of contents icon) but every time I try to get to an earlier page the app shuts down.
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The iPhone app ebooks that we sell were a special version of the Stanza ebook reader, which has been discontinued, so there isn't an update to fix that problem.
The work-around to solve the problem would be to extract the ePub file from the app using the instructions in this blog post, and then open in iBooks on your iPad -
If you have trouble with that, please send me a note at firstname.lastname@example.org.
I hope that helps,
O'Reilly Book Support