Continuity mistake: When Mary and Laura dive into the lake to rescue the puppies they have their shoes on. As they are swimming around looking for them they are barefoot. When the get out of the water their shoes are back on.
Continuity mistake: When Jason and Laura are flying the kite in one scene, there is heavy rain, thunder, and lightning and dark storm clouds shown in the sky, but on the ground showing the kids, the sun is shining on them (note the shadows).