The boy who played Owen received a dog just like Nelly at the end of shooting the film. The crew pretended it was an extra scene so he would be surprised. See more...
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Continuity: When Hubble is addressing the other dogs in a garage, on the day Owen can understand dogs, he is standing on a wooden crate. In some shots, there is a noticeable gap between the first and second piece of wood from the front on the crate. In shots from between Hubble, the gap has moved to be between the second and third piece.