As Kelso and Wolf are investigating the abduction scene near Blair's, the victim, car there are drag marks on the ground and the statement made that the victim was dragged away leaving her handbag and shoes at the car. In a flashback when the abduction occurs, Blair is scene being picked up and carried off, not dragged off.
Mary Magdalene is listed as a stoning victim. Nothing in the Bible or Christian tradition suggests that Mary Magdalene was ever stoned.
When Horatio discovers the stones used to kill the girl, he touches one of them without gloves and he moves it before it gets photographed. Both actions are compromising the evidence.