A title card claims 500.000 women were executed for allegedly being witches, but the worldwide number is believed to be 40.000 to 45.000.
In the flash back of Ursula being burned at the stake and saved by the rain, only her face appears to be charred while he clothing remains relatively unscathed. Her whole body should have been burned consistent with her face. Thus, her clothes should have burnt right off her.
This film is set during 1665, and someone calls someone a moron, but the first recorded use of that word was not until 1910.
During Grace's punishment, a number of nuns are involved in an official capacity despite the fact that nuns had been outlawed after the Dissolution and certainly wouldn't have been working in a legal capacity.
This film is set during 1665, and someone says being " blown to smithereens", but the first use of that word/ expression was not until the late 1800s.
When Grace rides to the town, it is a fortress by a river. She approaches from the top of a hill towering over the castle. For very good reasons, fortifications were not built on low ground, ringed by higher vantage points. No matter how thick the walls, attackers would simply fire into the stronghold from above, with defenders unable to fire back because of the angle.
Grace escapes by climbing down a well and then surfacing in a nearby river. Wells don't work like this.