XXXVII (The Birth of Evil Pt. 1) - S3-E1
Continuity mistake: 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.
Continuity mistake: When Jack meets the old father, watch the platform thing he is on. The yellow/black pattern alternates on the right side.
II (The Samurai called Jack) - S1-E2
Continuity mistake: 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.
Chosen answer: Gotta get back, back to the past...
Rlvlk