The Italian poster is totally misleading. It shows a woman whose throat is about to be slashed, but none of the women killed in the script die that way. The Italian title translates as "An open tomb, an empty casket", but the only open tomb in the plot is that of the first wife, who is seen very much occupying her open casket in the opening burial scene.
In the shot of the mice in the basement, the stones next to them shift for no apparent reason.