(at around 16 mins) When Maloney asks Eagan to help move a patient into the prison ward, the intern puts his newspaper on the chair he had been sitting on, and it slips to the floor with an audible noise. In the next shot, of Eagan exiting the room, the newspaper is resting on his chair.
When Lora holds up the thank-you note from Mortie, the position of her hands changes between the closeup of the note and the shot of Lora holding it.
When Max the Drunk motions Lora through the door, he drops his hand as Lora begins to leave. In the next cut, his hand is back up.
During surgery, 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.
When Dr. Bell tells Lora that Nanny needs a blood transfusion, she replies her blood type is "4A". There is no "4A" blood type, only O, A, B. and AB. However, according to Laboratory Medicine (Volume 9, NO. 1, January 1978), "In 1935, there were several nomenclatures being used to describe the blood system now known as ABO." Therefore, it is possible that, in 1931 in that location, a different blood type terminology was being used.
After Lora Hart is introduced to Maloney and the two leave Miss Dillon's office, they pass 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.
Both little girls are ill, but Desney is not seen for most of the film.
Maloney tells Lora early in the movie that they moved Desney to the housekeeper's room because Nanny is so sick.
In order to kill the two little girls, why would Dr. Ranger choose such an obvious method as starvation? (Even Lora, a new nurse, suspected it almost immediately.) Surely there must have been other methods which would be virtually undetectable.