Detailed Wired Guide to "Easter Eggs" of The Wizarding World of Harry PotterFans
Wired have posted a detailed guide to finding the hidden gems of The Wizarding World of Harry Potter on their website. The article, which comes complete with photos of what it is you're spotting at the theme park attraction, includes the location of the Monster Book of Monsters, Skele-Gro, Portable Swamps and more! The website additionally references the origin of the hidden gems back to the Harry Potter series by J.K. Rowling.
Find the article and its accompanying photos at this link.