It all starts with the girls being found dancing in the woods around a fire and sacrifices in the pot. Rev. Parris believe that they have signed themselves to the Devil and Tituba was the reason for it.
After being discovered in the woods, Betty would not wake up in the morning leading everyone to believe that witchcraft has hit Salem. Rev. Hail tried everything in the books to break the spell until Abby smacked Betty and told her that its safe to wake up, she wont be harmed if she admits to it.
It's A Lie!
Once the secret of Witchcraft was out, the girls that were found dancing in the woods became the determiners of who was and who wasn't a witch. They named off anyone that had crossed them or brought trouble to them- which was nearly half of the people in town.
Bye Bye Johny
After the girls were accusing everyone, John though for sure that Elizabeth was safe after Mary warren told him that she stood up for Elizabeth in court. After court that day, Mary brought home a Popet with a hidden needle under the layers of the skirt, which framed Elizabeth because Abby was "Stabbed" by Elizabeth's spirit earlier that evening. John fought to keep Elizabeth's name clear even though the court took her away.