Character mistake: When first talking to the sheriff on the phone, Mr. Kingman, the science teacher, refers to spiders as "insects" several times. A science teacher should know that spiders are arachnids, not insects.
Character mistake: In their meeting, Gavin Elster tells Scotty that the speedometer on Madeleine's car showed she'd driven 53 miles.
Character mistake: As the vicar, Moira and Charles leave the garage after returning the car, Mr Goorlie calls Ralph Charles.