During the surgery scene, all the doctors, nurses, and observers are wearing face masks but only their mouths are covered. Their noses are sticking out above the masks. There is no point in wearing a surgical mask if the nostrils are exposed.
After Lora Hart is introduced to Maloney and the two leave Miss Dillon's office, they pass the two interns in the hallway. When the interns turn to watch them go by around the corner off-screen, the shadow of the boom mike can be seen at the top left corner.