When Rosemary is getting ready to go through the closet to the Castevets' apartment, she takes down all the shelves and then goes away. When she comes back, the shelf above her head has been replaced.
Rosemary didn't close the closet door all the way before fetching the knife because towels and linens were blocking it, but the door is completely closed when she returns.
When Rosemary begins putting the Scrabble tiles away, the wrong anagram (one Rosemary had already discarded) can be glimpsed to the side.
When Rosemary is waiting to see Dr. Saperstein in the waiting room (right before she walks out in a rush), she is wearing red lipstick. Moments later, she walks to the phone booth and she is wearing light pink lipstick.
At Rosemary's party, Guy steps from behind the bartender to accept a drink in a closeup shot. In the following mid-range shot, from a different angle, he is shown in the background stepping up again to take a glass from the bartender.
When Rosemary comes home and makes her first complaint of her pregnancy pain to Guy she goes to sit on the sofa and a Scrabble game board is seen on the coffee table. When Hutch comes to visit a few scenes later, several days have passed in the plot and the Scrabble board is still in the exact same place even though Rosemary and Guy played a game of Scrabble in between these two scenes.
When Rosemary and Guy come back from dinner at the Castevets and they are in the bedroom, Guy loosens his shirt twice.
During the dinner scene at the Castevets' apartment, Minnie hands Guy a slice of cake with her right hand while licking icing off her left index finger; in the next shot her left hand is offering Guy the cake.
Obvious wig on Rosemary during the rape.
Rosemary's hair in the opening sequence from outside the building to inside the building.
Position of other tiles surrounding Rosemary's anagrams between shots.
At the beginning of the movie when Terry is found to have jumped out the window, Guy tells the police she had been staying with the Castevets in 7-E. When Rosemary introduced herself to the Castevets, Guy said he & Rosemary lived in 7-E.