Fruit Picking Day/Daniel Is Big Enough to Help Dad - S1-E11
Factual error: Daniel's dad glues and screws the door bell button to Daniel's treehouse. He does not connect any wires to it or anything of the sorts, nor is there a power source to the tree house. Yet he pushes the button and the bell rings loudly. It is too small to house batteries or a speaker on its own. And the bell was electronic sounding.
