Continuity mistake: First day in class, when Hoager "beeps" at Jesse, Mrs. Myers writes two words. The word "verb" is over the word "subject" on the board, in the close-up. After she turns around, in the following shots, the word "predicate" appears, disappears, then reappears and "subject" is written over "verb" now. Additionally, during this scene, all the other writing on the blackboard changes between shots as well.
Other mistake: During the credits, Squogre is spelled wrong, as revealed in the DVD commentary. It's spelled as "Sqouger"
Factual error: The creature Jess catches in the greenhouse is a Common Brushtail Possum, which is only found in New Zealand and Australia. Though the film was shot in New Zealand, it is supposed to be set in Lark Creek, Virginia, a rural area in the southern part of the United States.