As the rubber compound is being applied to Lucy's face, it appears and disappears from her forehead.
In the opening scene, Father Simeon recites from a leather-bound bible a supposed quotation from Isaiah 14, about Lucifer's return to Heaven in majesty after being cast out. Isaiah 14 says nothing about Lucifer's return, only his casting-out.
Although the hospital in the final scene is supposed to be in Rome, the label on the hydrogen peroxide bottle on the dressing tray is in English.
Norah refers to a clam as a crustacean; clams are mollusks.