Hey,
I'm having similar problems with Lulu right now ("invalid images" and "unmanifested files" messages), but some of the others I think I can help with.
Unmanifested files: you have a file within your epub that is not listed within your OPF. My guess is that you included the "com.apple.ibooks.display-options.xml" file.
file permission errors: some of your files do not have the correct access rights. Not sure on which OS you created your epub but the files probably have permissions set to 600, and would need to be changed.
Contains invalid creator XML: the format of the metadata used for the creator is incorrect. The valid format should be:
Code:
<dc:contributor opf:role="cre">FName LName</dc:contributor>
and it should be consistent throughout the document.
Contains invalid publication date: make sure that the format is correct. Correct format is YYYY-MM-DD (such as 2012-02-07)
Contains invalid publisher XML: make sure that the format is correct. As an example,
Code:
<dc:publisher>Lulu.com</dc:publisher>
Hope that helps a little.