As stated in a previous post, when Father Ralph goes into Mary Carson's bedroom after she has passed, and places the coins on her eyes, Barbara Stanwyck can visibly be seen breathing, but you can also see her pearl choker moving from the pulse in her neck.
In the first episode when Mary gives the horse to Father Ralph after he won the horse race, you can see the shadow of the film crews head on the flank of Ralphs horse/leg.