It's difficult to give much detail to the leaves in a tree in handmade animation, because the structure of the canopy has to be coherent over the consecutive frames. So, maybe the animator didn't plan to make it look as if there was stormy weather, but that might also be interpreted as a reason for the weird shuffling way that the man walks with the mysterious item held in front of him. The steps of the man with the wheelbarrow look more natural, which is quite a feat for an animator who has to analyse such a complicated motion by eye and then find out how to reconstruct it in 10 drawings.