The plant, "Little Joe", has no leaves, so that it cannot produce chlorophyll.
Joe pulls away from his mother, he does not push her. There is not reason that she would fall backward.
This is not a goof. Alice (Joe's mother) is pulling Joe and herself backwards, and is using a lot of force to do so; therefore, when Joe manages to slip his arm loose from her grip, the natural consequence is that she falls backwards.
This is not a goof. Alice (Joe's mother) is pulling Joe and herself backwards, and is using a lot of force to do so; therefore, when Joe manages to slip his arm loose from her grip, the natural consequence is that she falls backwards.