Grace tells Rosemary, "It was what it was.", a past-tense of 'it is what it is.' This is a modern day expression and would not have been used in the Spring of 1916, when this episode takes place.
When the doctor runs into Grace and Spencer, he tells her she should bring Spencer by in the morning "before the (founder's day) festival." But Rosemary (and Fiona) are just planning the festival. It makes no sense that an event like this would still be in the planning stages the day before it's suppose to take place. There's a disconnect in the time-line somewhere.