Find the key under the lid. To get the book, insert, push, and remove the key.
To find the flask, go to the weed, then go north, west, then south. When you get the flask, fill it by the stream.
To get out of the ungetoutable room, do this: open the chest, get the garment, remove the doublet, burn it, wear the garment, examine your hands, wash them, look in the mirror and wash your face.
You can avoid killing the traveller on the bridge by looking at the water and closing your eyes.
In the caves, throw the flint to get past the skeleton. When you see the hunters by the fire, look around, climb the tree, look around again, then drop the touch powder on the fire.