Other mistake: At the end of the intro, before the logo appears you can see Mojo Jojo's brain. His brain is green and it should be pink.
The Powerpuff Girls Best Rainy Day Adventure Ever / Just Desserts - S2-E10
Plot hole: I don't think the police would throw the wife and children in the same jail cell as Harold.
Narrator: Sugar. Spice. And everything nice. These were the ingredients chosen to create the perfect little girls. But Professor Utonium accidentally added an extra ingredient to the concoction... Chemical X. Thus the Powerpuff Girls were born. Using their ultra-superpowers, Blossom, Bubbles, and Buttercup have dedicated their lives to fighting crime and the forces of evil.
Insect Inside / Powerpuff Bluff - S1-E1
Trivia: In "Powerpuff Bluff", Dexter makes a cameo appearance when the kindergarten kids have a nap time.
Moral Decay / Meet The Beat Alls - S3-E13
Question: How much money did Buttercup make from knocking teeth out?