When Christine visits her father's grave, we see several close-ups of the black wrought iron gate surrounding the cemetery. In these close-ups, you can plainly see that the wrought iron is actually wood that has been spray painted black.
The goof item below may give away important plot points.
When Desler is dragging Christine, he holds her right hand. The Inspector then shoots Desler and we see a close shot of him holding Christine's left hand to pull the ring off. The next shot is of Desler falling and letting go of Christine's right hand.