Hello Daniel,
First of all, congratulations on passing your exam! Thank you for your warm words regarding our products. And we will definitely be happy to see your lessons learned post.
As for the PDU's, if you completed the PM PrepCast (or any other professional development course/activity/event) BEFORE the date you passed your PMP exam, then, unfortunately, you cannot claim it for the PDU's. Here is what the PMI says about this:
"
Activities you completed before you earn a PMI certification are not eligible as PDUs."
For more details, please visit the PMI web site. The quote above is taken from the CCR Handbook, here:
www.pmi.org/-/media/pmi/documents/public...rements-handbook.pdf
Good luck in all your future endeavors!