Continuity mistake: When the girls first came out of the machine, they were actually just the size of insects, and the professor didn't need a helmet to see them, but when they was during the battle, he had to.
The Powerpuff Girls (1998)
1 mistake in season 4
Starring: Tara Strong, Tom Kenny, Elizabeth Daily, Cathy Cavadini
More quotes from The Powerpuff Girls
Boogie Frights / Abracadaver - S1-E5
Trivia: The scene of the Powerpuffs flying along the disco ball is parodied of a scene of Star Wars (episode IV). Note the PPGs having to shoot one area to explode the ball.
Moral Decay / Meet The Beat Alls - S3-E13
Question: How much money did Buttercup make from knocking teeth out?