This is a close-up of the broom and wand with Gryffindor house scarf wrapped around the books.
This is the a close-up of the quill, cauldron (which was later filled with cotton candy to simulate steaming potion), and Scabbers the rat peaking out from between the books. The quill is made of gum paste then painted with food coloring and is completely edible.
This is the part of the cake which rotated. The switch activated a gear box hidden inside the books and made the top part rotate to simulate the snitches flying around. I tried to make Harry fly after the snitch but he kept joining the headless hunt. A headless Harry Potter wasn't what I was aiming for so the 2 snitch arrangement worked out better.