Disappeared Dad: He explains in the tie-in book that his father, Federico, was a sea captain who went down with his ship, which is implied in the series when his father makes an appearance in a flashback in one episode (also played by Carlos Villagrán).
Freudian Slip: Whenever he slips and calls Profesor Jirafales "Daddy".
Improbable Weapon User: He would use his large bouncy ball to hit people over the head. It's especially noteworthy in the episode where the kids think the vecindad is haunted and they grab things to defend themselves from the ghost. While Chavo uses a broom and Chilindrina uses a frying pan, Quico used his rubber ball. Ironically enough, it seemed to actually hurt most of the time.
Dub Name Change: In Brazil, he's known as "Seu Madruga"(Which means either Midnight or someone who sleeps late; this is implied to be a irony joke with the fact he isn't the type that works till wee hours, or because he's said to be The Alcoholic).