When Jonathan is having his dramatic outburst with Georgia in the foyer of his home after she has left her premiere party to see him, in the various perspective cuts, his hair alternates between being wildly disheveled to neat and combed in place.
In the studio, when Rosemary talks to Jonathan about her home in Hollywood, he has his right arm folded, holding the cigarette. In the following shot, just before they leave, he has his right arm by his side.
When the director Von Ellstein and Shields are having their big spat on how a just-concluded scene should have been directed and the overall directorial style and vision for the picture, the cuts between the perspective views of their arguing show Shields alternately with tensed outstretched arms and then casually folded hands on the top step of the short ladder or whatever that was he was leaning on.
Jonathon coaches Georgia on how to seductively light a cigarette for her movie role but her part is in a historical picture in which she apparently plays a peasant/princess living in an era when women didn't smoke anyway - let alone use a cigarette as part of romantic allure.
In the section of the movie narrated by Bartlow, Jonathan is shown, alone in a room, having a phone conversation which has important repercussions later on. Since no one else was there, and Jonathan did not disclose this conversation, Bartlow could not have known of it.