Continuity mistake: In the scene where all of the dogs are talking in the Garage Nelly goes under a tarp of some sort.In one shot she is going under the tarp the next she is out of the tarp.And then she is back under the tarp.
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.
Continuity mistake: When 'Canid' 3942 starts his jump of fifty feet to get the ball, the ball comes from below him, even though Owen throws it from behind. It could not have bounced because it would not bounce that high.
Factual error: The boxer named Wilson is most definately a female dog even though Wilson is supposed to be a male. You can see this very easily when they're all in the park and they're rolling around on the grass.
Continuity mistake: When the Greater Dane first appears in the backyard she is not wearing any stone from the Homestar, but when she is on the hill with the other dogs she has it on.
Continuity mistake: When the movers close the doors to the moving van, they don't latch them properly, and the handles are obviously hanging down. In the next shot, the doors are closed properly, with the handles secured. Then the next shot, they're hanging down again.
Continuity mistake: 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. (00:20:15)