Original air date: 5/7/2004
Production code: PPG-604
Mo' Linguish: When Mojo agrees to do some community service in lieu of jail-time by teaching at the Townsville Community College, he teaches his lengthy speeches to the people of Townsville, putting the city in a total stand still.
Oops, I Did It Again: The Professor dreams he had made three normal little girls after realizing all of his successes are mere accidents.
Mo' Linguish provides examples of:
- Big "NO!": Mojo Jojo’s reaction to being sentenced to teach at the Townsville Community College - immediately adding "by which I mean I won't do it".
- Big "SHUT UP!": The girls' reaction to the Narrator closing out the episode in redundant fashion.
- Cool and Unusual Punishment: Mojo is eventually punished by being forced to learn to speak normally by the Talking Dog.
- Courtroom Episode: Downplayed; not an entire episode, but we do get to see Mojo Jojo being sentenced to community service by a judge.
- Department of Redundancy Department: Turned up to eleven when Mojo causes everyone in Townsville to adapt his style of speaking. Even Mojo himself lapses into this kind of speech more frequently than usual.
- Got Me Doing It: Even Bubbles and Buttercup get caught up in giving Mojo-like speeches.
- The Only One: Blossom says there's one one in the entire city that can teach everyone how to speak properly again: the Talking Dog.
- Talking Is a Free Action: Averted; speaking the way Mojo Jojo does takes a lot of time, and when everyone starts doing it, it causes all of society to come to a standstill.
- Villainy-Free Villain: Really, all Mojo wanted to do was teach a class what he considered to be fine speaking skills.
Oops, I Did It Again provides examples of:
- Accidental Good Outcome: Professor realizes that almost everything genuinely useful he has built was done by accident after he unintentionally makes sloppy joes through his own clumsiness. He feels ashamed of the fact that he rarely creates anything good on purpose, but he comes to terms with it by the end when he has an Opinion-Changing Dream about what would've happened if the creation of the Girls had gone according to plan; his life wouldn't have been as exciting.
- Achievement In Ignorance: The Professor again. This time he accidently makes the girls some perfect sloppy joes due to a series of antics usually seen with a Walking Disaster Area.
- Alternate Self: The Run-of-the-Mill girls to the Powerpuff Girls.
- All Just a Dream: The segment about the Professor creating regular girls is naturally just a dream.
- Bait-and-Switch:
- After his Hard-Work Montage, the Professor's "perfect invention" falls apart the second he declares he's finished.
- Tucking the run-of-the-mill girls in, the Professor says he'll be working late tonight in the lab. He appears to be hard at work on some invention, only for it to turn out to be a pizza.
- Continuity Nod: Bubbles brings up Dynamo as an example of the Professor creating something great on purpose, though the Professor doesn't agree with her considering the damage the machine caused and the angry reaction it got him from the Mayor and the rest of the city.
- E.T. Gave Us Wi-Fi: Buttercup claims that aliens gave us Velcro.
- "Everybody Laughs" Ending: The girls and the Professor over him once again inventing something great by accident.
- Hard-Work Montage: The Professor goes through one when trying to create something on purpose.
- Heroic BSoD: Professor Utonium suffers one after realizing that he's an accidental professor.
- It's a Wonderful Plot: The Run-of-the-mill girls sequence is basically what would've happened if the Professor hadn't added Chemical X to the concoction, basically if Jojo hadn't pushed him causing him to break the bottle and spill it in.
- Late for School: According to the Professor, this happens quite often to the run-of-the-mill-girls.
- Mythology Gag: The Run-of-the-mill girls are based on a design for the Powerpuff Girls that Craig McCracken considered using when a test audience reacted negatively to his original Powerpuff Girls design.
- Nonstandard Character Design: Played with. The Run-of-the-Mill Girls have more proportionally-drawn faces (noses included) and fully formed hands and feet.
- Oh, Crap!: The Professor when he realizes to his shock that all his greatest inventions have been cases of Achievements in Ignorance, and he never invented anything great on purpose.
- Opening Shout-Out: The Professor's dream opens with a mundanization of the show's usual Title Sequence. For example, instead of showing the Powerpuff Girls Atop a Mountain of Corpses, the new sequence shows the Run of the Mill Girls standing on a pile of laundry.
- Overly Long Gag: Betty, Buttercup's "Run of the Mill Girls" counterpart goes back to get her schoolbooks as soon as everyone's ready to go to school, causing the rest of her family to wait a long time for her until she comes back with the books. If she had superpowers like Buttercup, she would have gone and came back in no time flat.
- Spinning Clock Hands: Seen during the Professor's Hard-Work Montage.
- Series Continuity Error:
- In a flashback to when he created the Powerpuff Girls, the professor can be seen knocking over a vial of Chemical X, spilling the content into his formula. This, however, contradicts previous episodes (and The Movie) that showed Mojo Jojo was responsible for the accidental addition of Chemical X.
- In the alternate world where the girls never had powers, Townsville still suffers from giant monster attacks. It was previously established in "Super Zeroes" that these monsters only attack the city specifically because they want to make a name for themselves by surviving a fight with the Powerpuff Girls.
- Slice of Life: The whole run-of-the-mill girls segment is this, since the girls don’t have superpowers in that reality.
- Title Drop: the episode's title is said by the Professor after he again creates something great by accident.
- The Unreveal:
- At the end of the episode, the Professor accidentally spills Chemical X on a petri dish, resulting in something that is, according to the girls, his greatest invention ever, leading to a Title Drop from the Professor. Unfortunately, the thing in question remains off-screen and we never learn what exactly it is.
- The same thing can be said about the invention the Professor builds on purpose, only for to break down before we could see what it is.
- Unusually Uninteresting Sight: On the way to and from school, the Professor and the run-of-the-mill girls get stuck in traffic because of giant monster attacks. Despite their mundane lives, they treat this with supreme indifference.Professor: Someone really should get on that.
- What If?: The basic premise of the episode is; what if the Powerpuff Girls had been created the way Professor Utonium originally intended, without the accidental addition of Chemical X?
- You Are Better Than You Think You Are: As the Professor frets about never having done anything great on purpose, the girls point out that lots of great achievements were purely accidental.
