Other mistake: In the illustration on page 33, Arnold's hair on the right side of his head has four spikes. The hair on the right side of his head is supposed to have five spikes.
Other mistake: In Chapter 1, Mr. Simmons tells the class to nominate students to be the class president, and he writes down the candidates' names on the chalkboard. However, in the illustration on page 9, he is shown writing the names on a clipboard instead.
