Captain Underpants and the Attack of the Talking Toilets/Trivia

Trivia
 * Early versions of this book say "Another Epic Novel" instead of "The Second Epic Novel".
 * We learn that Melvin tells on people for things that are none of his business (tattles).
 * Later, in the fourth and seventh book, we see the Incredible Robo-Plunger and the Talking Toilets on Uranus.
 * In "The Adventures of Super Diaper Baby", Deputy Doo-Doo goes to Uranus as well. Also, in the fifth book the kickball on page 101 and 102 goes to Uranus as well. And in Super Diaper Baby 2, Rip Van Tinkle is escorted to Uranus. Uranus may be favoured because of the crude pun on the planet's homophone "your anus". The Robo-Boogers go there for a short time, too.
 * Mr. Krupp punishes George and Harold by making them fill chalkboards with the sentence "I will never do anything which angers my handsome and charming principal, Mr. Krupp, ever, ever again." George and Harold later get revenge when they are made Principals for a Day, and they punish many teachers (and Melvin) to write the following sentences on chalkboards:
 * Ms. Anthrope: I will get a life.
 * Mr. Krupp: I will be very, very, very, very, very, very, very, very nice to "George the Great" and "The Amazing Harold".
 * Mr. Meaner: I will chill out.
 * Ms. Ribble: I will stop being such a crab.
 * Melvin: I will not be a tattle-tale.
 * Melvin also appears in the sixth and seventh book and makes cameos throughout the series.
 * One of the students seen at the Invention Convention is called Madison Mancini; Madison Mancini is Dav Pilkey's niece.
 * Dav Pilkey actually wrote a comic book called "Captain Underpants and the Attack of the Talking Toilets" when he was in the third grade, though his version was different from George and Harold's version.
 * Mr. Krupp claims that since George and Harold are suspended, he doesn't have to listen to them anymore and that they can no longer come back to the school, but this would not be the case in real life. If George and Harold can't attend the school anymore then they would have to be expelled from the school not suspended since a suspension is only temporary while being expelled is permanent. Even someone like Mr. Krupp should already know this.
 * Donny Shoemeyer's invention is called the Ping-Pong Serve-o-Matic as shown on the label on the machine. However the sentences in the book call it the Electric Ping-Pong Ball Server.