At various points during the film, the demonic potion bottle varies between a clear glass bottle partially filled with blue liquid and a blue glass bottle in which the liquid cannot be seen.
About two-thirds through the film, Paula Clarkson and Dr Delancey are driving along the coast. They turn off the coast road to head inland up a hill. In a cut, they are back on the coast road. The car brakes and swerves to avoid an oncoming lorry and ends up near the cliff edge, front pointing at an angle away from it. A cut then shows the car front pointing over the cliff edge.
During the movie you see the mic appear a lot of times.