Other mistake: Calvin was from a poor family and lived in a bad neighborhood. The school official believed Calvin was "very very intelligent", "perhaps gifted", and pointed out that he scored "in the top ten percentile" on the PSAT. Regardless of intelligence, it is highly unlikely that a student like Calvin would score that high on the PSAT (more like "bottom 10 percentile"). PSAT and SAT scores are correlated with family income, social class, and parents' educational level. Poor smart kids get low scores. (00:08:35)
Other mistake: Standing on the porch, Glen could hear Charlie talking to Jesse (sitting near the wall opposite the window). While peeking through the side of the curtain, a neighbor saw Glen and started yelling: "Hey! Hey, get the f - away from their window! Hello? Get over here!" If Glen could hear what was being said inside, Charlie and/or Jesse should have been able to hear a woman screaming not far from the porch. (00:29:31 - 00:30:03)
Other mistake: Jesse does not talk because of his traumatic childhood (which includes being kidnapped at a young age by Mr. Charlie), so it doesn't make much sense for him to be the narrator.
