Drawing this made me nervous, mostly for the hollow log. We all understand that characters move around, so a little change is to be expected from scene to scene. Even the backgrounds will move a bit, but a log - that doesn't move, so it should look the same in every panel. In the end, I cheated a little by drawing the knot on the top, which your eye notices and compares to the previous panel, making you overlook the fact that the shape of the log's opening is different.
At least, that's the theory. Oh, Happy Thanksgiving!