Continuity mistake: Rosemary goes into labor and the pillowcase on her bed has flowers on it. In the next shot when she wakes up even though she's still wearing the same dress, the pillow cases are different now having yellow and white stripes. (01:58:50)
Continuity mistake: The morning after the birth Rosemary wakes up and startles Laura-Louise, and the face of the clock behind the bed is lit up. In the next shot as she looks at it's not lit up. It's also ticking yet the second hand doesn't move. (01:59:25)
Continuity mistake: After the birth, Dr. Sapirstein injects her twice with sedatives but when we see Rosemary's arm as she is recuperating there are no burses or marks that we can see where she received the shots. (02:00:45)
Continuity mistake: In order to fool the witches Rosemary takes the pills that they give her and sticks them between a brick and the middle shelf of her head board. When we first see this spot the bricks are flush with the shelf but in the next shot the shelf has been moved out about three-quarters of an inch past the bricks. (02:03:50)
Continuity mistake: Rosemary believes that her baby is still alive and when Laura-Louise takes back the tray from her, Rosemary puts a dirty spoon into the glass of breast milk to see her reaction. In the next shot Laura-Louise holds up the spoon but there's nothing on it. (02:04:35)
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: Rosemary goes to the kitchen and gets a knife and proceeds back to the closet that connects her apartment with the Castevet's. When she left the closet before getting the knife the shelves were stacked against the doorframe, but now as she returns the shelves are neatly stacked against the far wall. (02:05:25 - 02:07:35)
Continuity mistake: When Rosemary has decided to sneak over to the Castevet's, she removes the towels from the closet shelves. She then tries to shut the door by pushing the towels (on the floor) into the closet. We see that the closet door does NOT shut all the way. Rosemary goes to get a knife, when she gets back to the closet, the door is completely shut, and she must now turn the knob to open it. (02:06:45 - 02:07:35)
Continuity mistake: Rosemary goes to the kitchen and gets a knife out of the holder with the remaining knives visibly crooked. In the next shot as she walks out of the kitchen they are straightened out. (02:06:50)
Continuity mistake: Rosemary walks into the party holding a knife and we see Guy talking to Minnie who is sitting next to a table full of gifts. Next time we see the table two shots later the gifts have been moved without anyone going near them. (02:08:45)
Continuity mistake: After she sees the baby, Roman says to Rosemary, "His power is stronger than strongerÂ…" and the clock on the back wall reads 8:20. Two shots later we see Laura-Louise's wrist watch and it reads 6:07. (02:10:55)
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)
Chosen answer: It doesn't have a specific title. It was a lullaby written for the film by Krzysztof Komeda. There's a few variations of the lullaby heard throughout the film, the opening credits version is listed as "Rosemary's Baby Main Theme - Vocal."
Bishop73