I've got some tips for doing the monster scene without locking the door. First of all, the code is always the same, 591, you don't need to use the bear. When turning the dials, you can put the cursor at the top or bottom of them to turn them up or down - that means, you turn the first one either direction till you get 5, turn the second one down to get 9 and turn the third one up to get 1 (you'll see what I mean when you do it).
Take the jar of coins, go under the bed, look at (right-click) the air vent. This makes it so interacting with the jar (left-click in the inventory) will make Anna take a coin out. Drag the coin from your inventory to the vent and you've done it! And of course, skip through the text as fast as you can.