When Bruce Baldwin comes to the press room late in the movie, an electric fan and small shelf on the wall to the left of the door both completely disappear. Both have been there in all previous scenes and both reappear after this scene.
After Walter's checkup, he puts his tie back on. At first, the skinny (back) end of the tie is longer than the wide (front) end. In the next shot, the front is properly longer than the back. When he goes to put his coat on, the back is longer than the front again.
In the Press Room Hildy yanks the private line telephone out and throws it in the corner. In the next scene the phone is connected again when she calls The Morning Post.
When Hildy is in Walter's office, a few lines before she throws her purse at him, his cigarette switches from his right hand to his left between shots.
When Walter goes to take Hildy and Bruce to lunch, his hat jumps from his right hand to his left hand between shots.
During the lunch scene, at one point there is a fly walking all over the front of Walter Burn's suit.
Flies get into buildings and often land on people, especially when food is near.
Flies get into buildings and often land on people, especially when food is near.