Trivia: Dammers' death was originally far less graphic, with him being shot in the chest and there being little-to-no on-screen blood. However, the MPAA gave the movie an R-rating, shocking director Peter Jackson since he shot it to be PG-13. As an act of defiance, he went back and used CGI to change Dammers' death and make it far more graphic and "R-rated," by having his head explode with a fountain of blood and gore. Dammers' original death was later used in the edited-for-TV version of the film.
Trivia: During production, Peter Jackson personally purchased over 30 new computers for WETA in order to help get the special effects done on time. After the film was complete, he tried to think of another project that he could work on in order to utilize all of the computers he purchased for the film, not wanting them to go to waste. He thus decided to work on a fantasy film next - and this project would later end up becoming his famed "Lord of the Rings" film trilogy.
Trivia: To date, this is the last major live-action film Michael J. Fox has starred in. Due to his struggles with Parkinson's disease and his desire to spend more time with his family, he decided to dramatically cut down on the jobs he took after completing "The Frighteners." Since its release, Fox has mainly focused on voice-over work and supporting roles in film and television projects, as they require less of a time commitment.
Trivia: Early on in production, "The Frighteners" was in consideration to be the second "Tales from the Crypt" movie, after "Demon Night," and before "Bordello of Blood." Producer Robert Zemeckis liked the story so much, however, that he decided to produce it as a stand-alone work.
Chosen answer: For the most part, the actors playing the ghosts were shot separately on blue-screens, and then comped into the scenes. (By removing the blue background through a process called "color keying", and placing them over the scenes) They were simply given a blueish glow and made semi-translucent to complete the effect. It was pretty cutting edge back in the 90's, but nowadays, it'd be very easy to make the exact same effect using a simple program like Adobe After Effects.
TedStixon