Rose's mom tells her to put a cast iron skillet on to soak. It is a fact that soaking in water ruins cast iron pans.
In the beginning of the movie, as Rose is walking through the house calling for her mother, a baseboard phone jack can be seen. These types of jacks were not introduced until the 1970s.
The characters of Macy Comstock and Anna Comstock are misnamed in the credits. Comstock is Macy's maiden name and her married name is actually Burnside. In the credits of the 'film within the film' that Anna screens at the end of the movie you can see Anna's name listed as Anna Burnside.