The shovel somehow manages to get upstairs between the decapitation of Afro-Zombie and the finale without anyone taking it upstairs, and indeed with no reason for it to be there.
When Jordana re-enters the cellar with the shovel, a redhead light is visible in the bottom right of the screen.
The gels covering a light are visible on the left of the shot when Norbert berates Jordana for overdosing the subject.