Character mistake: Although Henry borrowed two books on crime scene investigation from the used book store, he obviously did not learn enough, especially about forensic science. For example, shooting from the tree house could be determined by the location/slant of the bullet in Glenn's head/body, and cutting off tree branches that would obstruct the line of fire could be evidence of pre-meditation. Henry may have thought he planned the perfect murder, but it was far from that. (00:30:30)
Character mistake: Principal Wilder told Henry she would not subject Glenn to public scrutiny "without conclusive evidence." Wilder noticed Christina's hesitation and partial emotional breakdown during her ballet dance at the talent show and suddenly believed Christina might be an abused child. Much of Christina's body/skin was exposed wearing the dress, but no bruises (concrete evidence) were visible. Christina's temporary difficulty could have easily been due to stage fright, but Wilder called CPS. (00:21:23 - 01:27:00)
Character mistake: Henry believed his call to the Saratoga County Help Line #1-518-555-0121 was not effective because Glenn's brother George was the Social Services Director. The genius failed to look above the county level and discover there's a STATEWIDE CPS number that he could have turned to #1-800-342-3720. A call to the State CPS hotline probably refers calls to the relevant county, but Henry could have used what he wrote in his notebook "Why Calling Child Protective Services is not a plausible option." (00:28:56 - 01:01:11)
Suggested correction: It isn't clear what number Henry called. He had the county number underlined on the brochure, so I assumed that was the number he called. However, I replayed that part and the person who answered said "Child Protective Services." There was another number above for "National Help Line for Victim Advocacy" 1-800-555-0199, but that's not the National Child Abuse Hotline.
