Continuity mistake: When all of the dogs are chasing the two bullies and they are jumping over the leather couch, one of the dogs goes under the couch twice between shots.
Good Boy! (2003)
Ending / spoiler
Directed by: John Hoffman
Starring: Matthew Broderick, Molly Shannon, Kevin Nealon, Liam Aiken, Brittany Moldowan
Hubble and the other dogs come back but Hubble can't speak and licks Owen, who loses his ability to communicate with dogs.
eXZedeX
More mistakes in Good Boy!
Wilson: You can really understand me? Right now, you can understand what I am saying to you?
Owen: Yep.
Wilson: Can I have a cookie? No wait, ten cookies? No, can I have twenty cookies? Twenty cookies?
Trivia: 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.