In a close-up, the plastic skull on the shelf starts quivering but, on the long shot, it's perfectly still, as it's seen behind the woman's head.
None of the 19 people convicted of witchcraft in Salem, Massachusetts in 1692 were burned at the stake. They were all hanged. The 20th victim, Giles Corey, was pressed to death while they tried to get him to make a plea.
Only the movie version of 'Carrie' has a character impaled by flying knives. In the novel version, Carrie killed her mother by stopping her heart.