Monster House is a 2006 animated feature length film for a middle grade audience. The script was written by Dan Harmon and Rob Schrab. Harmon and Schrab had collaborated on Laser Fart previously, a film which I have not seen and will not be adding to my watch list. Monster House is already 12 years old, but the animation still looks pretty good. It was animated at a time when actors were just starting to be used as models, which is why this looks better than The Polar Express. The one thing significantly improved by modern processing power is hair. Inability to depict hair and skin is why Pixar decided to make their first animated film about toys. The hair on the characters of Monster House looks plastic, like you get on a 1980s Ken Doll, compared to what you see in, say, Brave, of 2012, in which hair is almost a character in its own right. (Animators have since gotten over their hair obsession, I think. Now hair is just hair!)
Screenwriter Harmon has been working in television since Monster House, notably on Rick and Morty. He also lists The Simpsons in his credits. Schrab has also been working in TV, most notably on The Sarah Silverman Program. Basically, these are youngish American comedy writers with a male sensibility.