In the first moment of Book 2 Chapter 1 in Pottermore, first you can pick up Flower Heads in the first level of zoom.
AFTER you have completed the first four chapters, come back to Chapter 1 moment 1, and within the second level of zoom, collect the Cornelius Agrippa Chocolate Frog Card and Bertie Bott’s Sprout-Flavored Bean in the second level of zoom. The frog card is right above the bean.
Meanwhile in the third level of zoom within Moment 1, you can pick up Honey.
In moment 2, you can pick up Pruning Shears in the second level of zoom.
You can pick up some rose thorns in the third level of zoom of moment 2.
Dried Nettles can also be picked up in moment 2 within the third level of zoom.