Continuity mistake: In the movie "Channel Chasers," when Timmy and Vicky go into Maho Mushi, Timmy gets a piece of his hat sliced off and Vicky gets the tip of her ponytail sliced off. But in the next shot, they're both back to normal.
Injustice For All (1) - S1-E18
Continuity mistake: When Trina runs to her dad, he gets down on two knees. In the next shot, when Superman and Flash arrive, he is seen kneeling on three legs.
Fiend is Like Friend Without the 'R' - S1-E4
Continuity mistake: Mandy hits a baseball with one of Grim's bones, yet when we see Grim, there are none of his bones missing from his body.
Continuity mistake: In the episode when Penny went to work with her mom and the Magician comes in with the tiger that is acting strangely. The tiger is sitting on the floor and has just eaten its food. Penny is standing there next to the tiger, the camera goes to her mom for about two seconds, then it goes back on her and the food has returned in the bowl again. Then it's empty again.
Episode XXVII - Chicken Jack - 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.
Duck/Aren't You Chupacabra to See Me? - S4-E9
Continuity mistake: Mandy is in the library working on her report. When she's working on the second page, the writing is scribble, and on top of a stack of paper. A second later, the page says "CORN by Mandy", and the stack of paper is gone.
Continuity mistake: While Mr. Klimer is forcing Debbie into the car, he for some reason seems to have a Charlie Chaplin-esque moustache which he doesn't have in any other point in the episode.
Continuity mistake: When Clover accidentally steps into a black substance in the tunnel, she removes her right boot. However, when she and Sam are about to jump into the tunnel driller, her left boot is missing.