Revealing mistake: When Scott (covered in ice) is ejected from the pool in front of Bruce, watch carefully. In the first few shots, he has some pretty convincing "ice" prosthetics attached to his body. When the camera cuts after he runs into the door, however, suddenly he's merely covered in really cheap-looking foam/slime that doesn't resemble ice in the slightest. And it's not supposed to be ectoplasm, it's supposed to be ice.
Revealing mistake: When Bruce and Patricia are on the crane on the roof, a wide shot of them both reveals their stunt doubles. (01:24:55)
Visible crew/equipment: The movie is all about reflections, but I don't think it intended to have a camera rig reflected in a teapot in the first scene with Zelda Rubenstein. (00:20:40)
Continuity mistake: When Scott and Donna return to the pool with the snacks, the position of the Coke cans that Scott is holding changes before he and Donna kiss. Note the position of the barcodes. (00:45:00)
Answer: At the end of the movie, it was a different actress who played Carol Ann as the actress had already died by that point. Rumor has it that the actor who played Scott was so distraught over her death that he couldn't come back to film the scene.
lartaker1975