Goofs

When Rex, Boss, King, and Duke exit the trash compactor, they are shown to be covered in dirt and soot. However, when the shot changes to the point of view of the drone (looking down at the dogs), all four are completely clean.

Near the beginning of the film, a pack of white dogs walk up to a bag of garbage that was dumped in front of them before being confronted by Chief's pack. The film then cuts to a wide-shot of the packs snarling at each other from either side with the bag in the middle, even though it was right in front of the white-furred pack in the previous shot.

When visiting Jupiter and Oracle, Chief, Duke and Rex all stand closest to Jupiter with Boss and King standing just behind them. When Atari pulls out his picture of Spots, Boss and King are now standing next to Duke and Chief with Rex standing behind them.

In a lot of the scenes that feature simultaneous interpretation, the interpreter will begin to say something in English before it has been said in Japanese. In fact, because the verb comes at the end of a Japanese sentence, it is impossible to interpret in the manner depicted in the movie. Even the very best interpreters will be a few seconds behind the Japanese.

Many of the signs contain incorrect or awkward Japanese, as though produced by an advanced (but non-native) speaker.

When Atari makes it through brain surgery but the doctor explains that the boy's remaining kidney has failed, Mayor Kobayashi is seen in the hallway oval safety mirror gesturing with his handcuffed hands towards the Right side of his body while saying to take his Left kidney. The scene used the mirror to fold together a closeup of the doctor and Tracy while showing Tracy's class and Mayor waiting farther down the hallway. The animation team tried to take into account the mirror's effect, but Left in the hallway and Mayor facing the doctor would still be on the Left in the mirror.

Messenger owl drinks water. Owls do not drink water; the only fluid in their diet is the blood of their prey.