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 Nano Of The North - chronological order
Starring: Tara Strong, Tom Kenny, Elizabeth Daily, Cathy Cavadini
More quotes from The Powerpuff Girls
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?