Did you set your product attributes you want displayed in the additional info to be "Visible on Product View Page on Front-end" in the attribute settings?
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We decided against adding any extra stuff in the sample data that wasn't needed, to avoid any problems with people using the RocketLaunchers as starting points for their stores. So we only add the products and categories and that's it, we don't change any other settings, or any attributes values or anything.
STEP 1 IN MAGENTO DEVELOPMENT - DISABLE YOUR CACHE OR YOU WON'T SEE ANY CHANGES.
Use the new "secure" tab when replying for privately sharing links.
Check the
"Useful Snippets"
post for tips.