On your second case "Disappearance", go by the candy machine in the shopping plaza. Check the place on the machine where you put money. You will get a coin that is dirty. Get the starched cloth and wipe it off. It will then be clean.
Secret Group Photo
After finding all 50 items that consists of your Touch List, you'll be rewarded with a group photo of MacKenzie, Penelope and Chloe.