Contributed by: Omead Ibrahim
In 2004, Heather O'Rourke's Official Fan Site surprised fans by stating that Heather completed this movie before her death and that the ending was a re-shot despite Gary Sherman's interview in 2002. From photos, articles, an interview from a cast member Kipley Wentz and various production staff, it is said that MGM did not like the original ending and wanted a new one written. O'Rourke died before they could finish shooting the new ending. MGM insisted that Sherman would finish the new ending or it would find someone to do it for him.
Contributed by: Steven Murray
The ending of the movie was changed bacause originally it was planned for Carol-Anne to go off with the spirits, but after the tragic death of Heather o' Rourke, the studio thought that it would be in bad taste.
The idea behind Donna and her b/f killing the psychologist is that they are demons. One, the flesh tears off because it isn't their real skin, but a "mask" of sorts. Secondly, if you look at their clothes, the words are backwards, or "mirrored", which is where the demons, ghosts, etc. come through. I personally think that Tangina died when you see her skeleton because she touched the mirror when it was a doorway between the worlds (and seeing how water acts as a mirror, it would make sense that these too would be portals). When you see her later, it is inside the apt after Kane has taken it over. It's almost like he altered the "barrier" if you will, so that the window is now that doorway. If that is the case, then that room (or was it the whole apt?) was actually the other side. Of course, this all could be way too in- depth. I saw the last half of Poltergeist III before seeing anything else of the series, so I had to guess what was happening.