Try to find these bonuses yourself before looking on this page. If you really tried as hard as you can, but you still can't find them, then here are some hints. There are probably more things that we haven't found yet so keep on looking, and you might find more surprises.
In the vegetable garden just to the right of the scarecrow there is a green compost bin. If you click on it you will see a bunch of stars indicating that you found a bonus. The farmer's overalls will appear. It will automatically go to the clothes closet. The next time a Norn visits the clothes closet, it can put on the overalls.
In the castle there is a room with a bearskin rug, a fireplace, and a knight pacing back and forth. To the left of the fireplace there is a rope. Pull on the rope and a machine will appear. Click on the machine and a large magnet will lower from the ceiling. Click on the machine as the knight walks under the magnet, and you can catch the knight with the magnet. Some stars will appear, and you will get the knight in shining armor costume. The costume will automatically go to the clothes closet, so your Norns can try it on the next time they go there.
There is a secret passage to Cloudland behind the bookshelf.
Go to the vegetable garden, which is on the left side of the house. Pick up the pitchfork and hold it over the soil. Click to start digging. Click again to put the pitchfork away. Pick up the packet of carrot seeds. Hold it over the soil and click to sprinkle some seeds in the garden. Click again to put the seed packet away. Pick up the watering can and hold it over the soil to water your plants. Click to put the watering can away. (You can also plant flowers and other vegetables if you wish. Some seeds need to be watered at least twice before they will sprout, unless it rains. Most seeds will not grow during the winter when it is snowing.)
After your carrots sprout, pick one and hold it near the white pelican sitting on the roof of the toolshed. The pelican will open its mouth. Click to drop the carrot in the pelican's mouth. If it misses, pick it up and try again until the pelican gulps it down. The pelican will take the carrot to the kitchen for you. The next time you go to the kitchen, the carrot cake recipe will be available, and you can bake a carrot cake for your Norns.
Go to the castle dungeon, the room with the cheese machine. Click on the picture of the mummy, leaning against the blackboard. For a few seconds you will be able to see what the solved puzzle should look like, then the pieces will scramble up. Click on the puzzle pieces to slide them around until you have rearranged them correctly. A mummy will come out and dance around, and lots of stars will appear. The next time you go to the kitchen, there will be green eggs and bones in the upper right corner of the room, and the Green Grendel Cake will be accessible in the recipe book.