Continuity mistake: Near the end, Rosemary has a photo in her right hand. When Dr Fairborne starts to get aggressive, at first, Rosemary tries to keep the photo away from him, but when he grabs her and threatens her with a scythe on her neck, the photo has vanished.
Continuity mistake: On the second night at Julia's, Laura has insomnia again and this time she gets up and goes down to the gardens, which are bathed in light - much more than from a full moon. When Mr Elliott turns up while the girls are working, Laura says to him "Were you out star gazing last night, Mr Elliott?" And he says "Indeed I was, a partial lunar eclipse in wonderful darkness."
Continuity mistake: When Rosemary finds her second bunch of smooth ink cap mushrooms and picks one, then declares, "Fungus Ferguson. My old college professor," who will be able to tell Rosemary what is special about smooth ink caps - this has been bugging Rosemary for days - and then grabs her cardigan without dealing with the mushroom in her hands, which is no longer to be seen.
Continuity mistake: While the girls are packing up Charlie's belongings after he died, Rosemary brings out the small bag from the bathroom. Laura is seen rummaging around in the bag, looking for Charlie's auto-injector, but she just moves them around, until the next shot, where she suddenly has half of the items out of the bag and in her hand.