Factual error: Rosemary calls Dr. Hill from a pay phone and says, "The baby's due on Tuesday, you remember you told me June 28th" (and June 28th 1966 does fall on a Tuesday). In the previous scene in Dr. Sapirstein's office his receptionist is making an appointment "next week" for a patient and that date is "July 10th" indicating that if Rosemary is due on June 28th (which she says is next Tuesday) the dates do not match and it must still be the week of June 20th which is at least two weeks before July 10th. (01:44:45)????
Continuity mistake: Before she enters their apartment and sees her baby, Rosemary walks back to the closet that connects her apartment with the Castevet's and as she opens the door we see yellow linens on the top shelf. Several shots before as she takes the shelves down these yellow linens fell on her head and were not put back on the shelf. (02:05:25 - 02:07:40)????
Continuity mistake: Minnie gives Rosemary a cup of Lipton's tea as she sits in a chair in front of a book case. We first saw these books when Rosemary sat down and they were all vertical, but then when she gets the cup of tea the books in both shelves are slanting to the left. (02:11:20 - 02:13:20)????
Visible crew/equipment: Rosemary goes back to see Dr. Sapirstein and speaks to his receptionist. After she sits down they cut back to a close-up shot of the receptionist working and you can see the reflection of the camera man's head on the left of the glass file cabinet behind her. (01:40:05)????
Continuity mistake: Rosemary gets back into the apartment and gets Elise Dunstan's phone number from the phone book inside her pocketbook. She leaves the pocketbook right next to the phone book but when Dr. Sapirstein comes in the with a sedative she tries get away across the bed and the pocketbook is no longer there. (01:55:55)????
Continuity mistake: In the scene after learning she was pregnant, Rosemary cooks herself a "blue" steak (barely seared on either side), yet when placed on the table, and she commences eating, the depth of heat penetration indicates "rare" - much more cooked than "blue". (00:59:00)
Factual error: The story is supposed to take place from 1965 until the baby's birth in June,1966. Yet, before Rosemary is even pregnant, there is a 1967 Chevrolet taxicab sitting at the curb. (00:36:10)
Character mistake: After Rosemary has the baby and they tell her it died, she calls them liars. They give her an injection and she passes out. When Guy comes back, he says that the Doctor says she was suffering from prepartum (not an actual word) symptoms. It would actually be postpartum.
Deliberate mistake: As Hutch entered their apartment with his overcoat buttoned, his gloves were in the jacket pocket underneath and not in the overcoat. Later we see him take them out of his jacket and leave them on the coffee table as he speaks to Roman. Before he leaves Guy goes to the closet and gets Hutch's coat and the one lone glove appears where it shouldn't be, back in his overcoat pocket. (01:01:50 - 01:07:20)????