The ages of some of the women accused of being witches are wrong. Martha Corey, portrayed to be about 50-60, was actually 70. Abigail Franklin looks to be in her 20s, but was actually in her mid-30s. Samuel Wardwell looks to be 70, but was only in his 50s.
Flynn asks for a rifle. Rifles weren't invented until the 1800s. The correct weapon would have been a musket.