Go to Fan Sites and you'll find to coins next to two boxes, insert them in their box and you will receive a drawing of the Midnight Duel (including Seamus!)

On the main page, click on those glasses, and in the middle of the lower shelve should be a small vial (red), click on it and you'll get a first draft of the Hallowe'en chapter from the PS.

Also, in the Rubbish bin, click on the pen on the left, it will break and describe new things to collect, although I can't figure out the first two of them....