left hand is a bottleneck slide. its not permanent yet, you can see the muscle clamp moving causing the string to slack and thus a few mistakes. that electronic casio type drum sound is done by hitting the two by four with a dowel with rubber bands over it to make it a bouncy mallet. the scratching is a guitar pick made of a plastic coffee can lid. a dual pick like two clamped together on short peices of wood would be better a heavy pick for the string side and a really flimsy flappy thing for the washboard side. nails in the board with bottle cap jingles would also pickup and add some distortion. a small ceiling fan chain inside the can would also rattle. a cowbell? hmmm.