Factual error: In the Pope's coronation procession they play the anthem Zadok the Priest. It was composed by Handel for the coronation of George II in 1727, 235 years after this coronation took place.
Episode #2.3 - S2-E3
Factual error: At the end of the episode, Camille looks into Richard's telescope from the wrong end...and it works.
Factual error: When the tracking dog finds a gun in some bushes, Kenda, who is narrating, says that the gun was a Ruger Mark I, which is a semiautomatic target pistol; but the gun shown in the reenactment is a snub-nose .38 Special revolver.