Factual error: When Arnie and Leigh gives the hitchhiker a ride, on page 265 (Chapter 34), it says that the hitchhiker opened Christine's rear door. But Plymouth Furies of that era had only two doors.

Continuity: In Chapter 18, when Arnie and Dennis are about to finish their lunch, it says that the bell rung, signifying that there were five minutes till period five started, but a few pages later Dennis talks about the next period as being period six, rather than five.