Revealing: When Jack cuts the flying car's hood off, he slashes it vertically, but it is cut horizontally.

Continuity: Right before the three-eyed waitress leaves to talk to Aku, there is a shot of an octopus-like bartender, whose facial expression changes in each shot.

Revealing: Immediately after the time portal is destroyed, it stops raining but there is no moisture anywhere.

Continuity: When Jack meets the old father, watch the platform thing he is on. The yellow/black pattern alternates on the right side.

Continuity: Jack's father the emperor is a young man when he defeats Aku. At the conclusion of the movie, he greets his pregnant young wife. At the start of "The Beginning" movie, Jack is a very young boy, both his parents are well past middle age-and Jack has no sisters or brothers to explain the gap.