that's amazing, I'll have to watch for that the next time.

I noticed two new things when rewatching for the umpteenth time.
When they are having dinner together for the first time, while Rosemary and Minnie are washing dishes there is a quick cutaway to the two men looking very conspiratorial and smoke is wafting through. Clearly this is the point where Guy has been seduced into the coven. (When they come home suddenly Guy can't wait to go back tomorrow night.
And Alan Rickman has a brief appearance and one line at the funeral!

How crummy the headboard is on the bed!
It's made of two tiers of two planks of whitewashed wood, stacked on top of of two whitewashed bricks (2 on either side) with the whole set up literally stacked on the end tables that flank the bed, resulting in a huge gap between the wall and one's back.
I've literally seen Rosemary's Baby dozens and dozens of times and I just noticed this on my last viewing a few weeks ago. Amazing!
I told you a million times not to talk to me when I'm doing my lashes!

Mr. Nicklas (in the book: Mr. Micklas) played by Elisha Cook - before showing Rosemary and Guy the apartment he actually presses the doorbell before letting the couple and himself into the apartment. This detail is also in the book.
Why does he do that?
Mrs. Gardenia - the previous tenant is dead, there is nobody living there and Mr. Nicklas / Micklas presumably has the only key. Is he giving a warning to whoever may have come through the hidden door in the closet that people are entering?

Like all truly great films it seems that no matter how often you watch them, you pick up some new detail or something you missed before. Even if you watched the movie, like dozens of times. With this movie, you pick up even more if you've read the book. For example, in the book there's a passage about Rosemary's sculpture class. In the movie, there is a sculpture in the living room above the sofa which I now assume is Rosemary's work. The menu for the "Under 60" party is discussed in detail in the novel and if you look at what she's preparing in the movie, it's spot on! It's pretty amazing. One thing it took me a while to catch on was this: I'm pretty sure the shot of the tannis charm going down the sewer drain is shot on a soundstage. Amazing!

When the door to the apartment is first opened to show it to the Woodhouses, what catches your eye is the secretary at the end of the hall, directly facing the camera. It's brightly lit, appearing an almost orange color.
Of course, this key piece of furniture will gradually become the focus of the scene
.

Thats was a delicious bit of casting, similar to putting Mia Farrow in The Omen remake.
Although in the book, Rosemary is confused upon meeting Terry because she thinks she's Anna Maria Alberghetti (who was a real life musical comedy actress at the time of the book's publication.) (She was in
Carousel
, which was later filmed with Leslie Caron.)
.

Thats was a delicious bit of casting, similar to putting Mia Farrow in The Omen remake.

Vetri was also the 1968 Playmate of the Year (under a different name.) Later she shot her husband and was sentenced to prison.

Good detail. Victoria Vetri was very good in just that one scene she had. I liked the way she said 'they picked me up off the streetliterally.' And when she was talking about Mrs. Gardenia, there was a slight pause when she said 'Shewas a good friend of the Castevets'. That pause told of the unpleasant way Mrs. Gardenia and the Castevets parted ways.

That the actress that Rosemary remarks that Terry looks like, is in fact the actress that plays Terry. Victoria Vetri.

I always notice that too. Guy obviously knew what was growing inside her and was clearly afraid of it. When he touched her stomach to feel the "baby" it finally hit home. He pulls away with fear and repulsion as he does with Rosemary herself. He starts wearing pajamas to bed and is visibly distant with her. Guy had no strong religious beliefs and as Rosemary said was very self-centered putting his career first. Once he knows what is going on he appears very nervous and unsure of himself.

I was always aware how Guy snatched his hand away from Rosemary's belly, but hadn't caught how he was wrenching his fingers together. It was telling how he, in an unconscious way, was saying "Man, I'm in this deep."

That Guy never seemed to love Rosemary. Honestly, he seemed like he just tolerated her. That "make love" scene, it looked like they were both about to have a root canal as they jump into the fourplay!
I wonder if it's because both actors just lacked chemistry or is that the way Guy was written in the book? He just always looked suspicious. And in repeat viewings, I notice it more and more.
Also, I never noticed how short the actor looks.
You know a lot of people back then got married simply for the fact that "It was the thing to do" without ever really considering if they were truly in love. The idea of reaching your mid 30s and not be married and start to have children was unfathomable back then. So it is very possible they didn't
really
love each other.
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That's why his actions toward her are very believable.
My real name is Jeff

That Guy never seemed to love Rosemary. Honestly, he seemed like he just tolerated her. That "make love" scene, it looked like they were both about to have a root canal as they jump into the fourplay!
I wonder if it's because both actors just lacked chemistry or is that the way Guy was written in the book? He just always looked suspicious. And in repeat viewings, I notice it more and more.
Also, I never noticed how short the actor looks.

Oh, I didn't think about that. Good point.

Rosemary was not close with her parents. She went against the family when marrying Guy. He was a protestant and they were catholic.
At least thats what I remember from the book.
"something far for savage even than nature. Oliver Thredson was, to all appearances a kindly figure"

How do you know they were alive? Physically able to travel to New York?
Anyway, it is not common for a parent to call their sons/daughters every day, even when pregnant, in the United States.
My real name is Jeff

But so close to her giving birth? Mom would at least come around or call every day to make sure she was well.

Rosemary's parents probably lived in the state where Rosemary grew up - far from New York. I wouldn't expect them to visit Rosemary during the time-frame in the movie.
My real name is Jeff

Rosemary had parents. Why did they not visit.
That's hinted at in the book; Rosemary's parents didn't like GuyI think it was because he convinced her to elope instead of having a church wedding (Rosemary was raised a devout catholic).
I like looking back and catching Guy conspiring with the Castavets, for instance, when Minnie stops by on their "date night" to drop off the chocolate mousse, you can hear her mumbling to Guy, instructing him to give Rosemary the one with the almond on top of it. And the 'chalky under-taste Rosemary complains about is of course the pulverized sleeping pills Minnie put in it.
Yeah, they're dead, they'reall messed up!

Perhaps it's because she had polio as a child.
From Wikipedia:
When she was 9, she contracted polio during an outbreak in Los Angeles reportedly affecting 500 people. She was placed in an isolation ward for three weeks and later said the experience "marked the end of my childhood".
(W)hat are we without our dreams?
Making sure our fantasies
Do not overpower our realities. ~ RC

Maybe it's the way she really walks sometimes.
When you get up in the morning, how do you decide what shade of black to wear? (Shallow Grave)