Roe says that the murder of Julia Wallace occurred in 1934, but it actually happened in 1931. John also said the murders committed by Cordelia Botkin occurred in 1878, they actually happened in 1898. Roe mentioned Cordelia's victims were the wife of her former lover and her mother, but she actually killed the wife and her older sister. The chocolates sent to Aida were laced with rat poison, but Cordelia used arsenic.
The diagram Roe prepared against the wall half-rolled from both sides in order to take to the police. Later when Sally picked it up from Robin's car, it was single-rolled.
The books are supposed to take place in north Carolina, and a couple of the movies seem to identify a location in Georgia, but one of the TV vans shown outside the allisons' home is from kypn, and another microphone also has a k identifier. only stations west of the Mississippi start with the letter k; east they start with w.