- Charles S. Dutton originally had a small role in the film as a detective, however his part was removed as script rewrites came in.
- During the scene where Norma is leaving, she stands in front the car from Psycho (1960). The music playing in the background at this part is also from Psycho. Janet Leigh, who plays Norma, played Marion in Psycho. The license plate on the car is also the same as the second car Marion buys in Psycho, NFB 418, which are Norman Bates' initials.
- On the television in the girls' room a clip from Scream 2 (1997) is showing, reciprocating numerous Halloween (1978) references and clips in _Scream (1996)_ . However, according to producer Moustapha Akkad when the scene was filmed, the girls were actually watching So I Married an Axe Murderer (1993), making an entirely different joke: a movie featuring Michael Myers had its characters watching Mike Myers. The clip was changed to Scream 2 (1997) in post-production.
- When Molly is in the classroom, she spots Michael outside the school and gets interrupted by the teacher, and when she looks again he is gone, just like Jamie Lee Curtis did in Halloween (1978).
- The director and writers decided to treat this movie as if Halloweens 3-6 never took place. This was a decision made to keep the plot simple and focus on the Laurie character.
- When Jamie Lee Curtis' character says, "go down the street to the Beckers..." this was supposed to refer to the line from Halloween (1978), "go down the street to the McKenzie's house..." The name was changed to Becker, which was the last name of Drew Barrymore's character in _Scream (1996)_.
- In certain scenes, Michael can be seen wearing two different masks. The director decided well into production, to go with a different mask, so certain scenes were re-shot. Some scenes with the original mask can still be seen, and in one shot it had to be altered with CGI to replace Michael's old mask with the new one.
- The line "everyone is entitled to one good scare" is said by Norma to Laurie. Sheriff Brackett (Charles Cypers) originally said it in the first Halloween.
- In the original Halloween when Laurie is in class we hear the teacher talking about fate. In Halloween H20 when Laurie is teaching, Michelle Williams gives an answer about fate.
- The reports that Kevin Williamson's original treatment for "H20" included a scene in which "Halloween 4" through "6" are acknowledged as being "in continuity" and "canon" are completely accurate. The scene did exist, and involved a bitchy student at Keri/Laurie's school giving a class report on the "Haddonfield Murders", and going into great detail about Jamie Lloyd, Danielle Harris and JC Brandy's character from "Halloween 4" through "6". The student talks about Jamie losing her parents in an auto accident, as was the explanation in those sequels for Laurie Strode's absence. (In fact, the only reason for Laurie to be in the Witness Production Program with her son under an assumed name as "Keri Tate" at all was because the original story for "H20" was conceived like this, with "Halloween 4" through "6" in continuity, and Williamson thus being required to create an explanation for Laurie's "death" in the previous movies and her subsequent resurrection.) The student's report chronicles Jamie's being hunted and eventually killed by her uncle, Michael Myers. Upon hearing this oral presentation in the classroom, a grief-stricken Keri/Laurie then retreats to a restroom and throws up. This scene was of course omitted from the actual film.
- The original treatment for "H20" by Kevin Williamson was much more sparse on character detail and had a radically different ending. In the place of Nancy Stephens' character of Marion Whittington in the trademark "Williamson opener", a new character was originally to be created, "Rachel Loomis", apparently Dr. Sam Loomis' daughter, who would have the computer files on Laurie Strode/Keri Tate on her home computer. Rachel would come home to discover her computer on, and would swiftly be dispatched by the Shape. Also, in the climax of the treatment, there is a massive helicopter and bus chase sequence, culminating in the downed helicopter spinning out of control and decapitating the Shape with its out of control rotor a la "Mission: Impossible".
- The movie was made after a suggestion by Jamie Lee Curtis. She wanted to "20-year Anniversary" movie with John Carpenter, but the director declined.
- P.J. Soles was originally approached for the role of Keri Tate's/Laurie Strode's secretary. Soles never gave a straight answer as to what she wanted to do, skeptical about returning to the series as someone completely different then her character Lynda, originally killed off in Halloween. She eventually lost the role to Jamie Lee Curtis's mother, Janet Leigh, who was approached after not getting an answer from Soles.
- Kevin Williamson was originally hired to write the script and was said to have actually finished a draft or two with the input of Jamie Lee Curtis. Williamson's script was eventually not used, but a treatment he wrote for the movie is said to be a heavy basis for the final, filmed version.
- According to H6 writer Daniel Farrands, who wrote an early draft of the film, said there was originally a scene scripted and supposedly filmed where a student in Laurie's class does a report on a book called "The Halloween Murders", in an effort to tie all the movies together. This was dropped however, when it was decided by the director and producers to ignore "H3-6" so as to concentrate more on the Laurie Strode aspect of the story.
- On one of the newspaper clippings seen during the opening credits, a picture of Dr. Sam Loomis can be seen. The character was featured in the previous Halloween films, and was portrayed by Donald Pleasence.
- The teenagers at the beginning are watching Plan 9 from Outer Space (1959).
- LL Cool J's line, "Comb your hair!" was ad-libbed, inspired by Josh Hartnett's messy haircut.
- The majority of John Ottman's original score was rejected late in post-production and replaced with Marco Beltrami's scores to Scream (1996), Scream 2(1997), and Mimic (1997). The producers wanted a darker, more Scream-like score, while Ottman's score wasn't strong enough to fit the bill. Some of what remained of Ottman's score was heavily edited and often was used for scenes for which they were not originally intended. Nonetheless, Ottman's music was later released in its entirety on an album entitled "Portrait of Terror", from Varese Sarabande Records.
- P.J. Soles was asked to play the role of Norma Watson. That was also the same name as the character she played in Carrie (1976)
- The phrase "Do as I say" is spoken twice by Laurie while escorting the students to safety. This same line was spoken to the children in the original Halloween movie.
- Originally, director Steve Miner wanted Jerry Goldsmith to score the film, having already worked with him on Warlock (1989) and Forever Young (1992).
- Josh Hartnett's film debut.
- During the credits in the prologue, Dr. Samuel J. Loomis' dialog from the first film about Michael's incarceration is heard. The studio, instead of recovering the original audio from the original scene, decided to use a sound-alike actor named Tom Kane to provide the voice-over.
- Director Steve Miner also directed two films in another popular horror series: Friday the 13th Part 2 (1981) and Friday the 13th Part III (1982).
- In the film, a clip of Scream 2 (1997) is shown. Chris Durand, who plays the killer Michael Myers, had an uncredited role as a stunt double for the masked killer in 'Scream 2.'
- One of the masks used from Halloween: The Curse of Michael Myers (1995), was used for the first scene appearance of Michael Myers.
>>> WARNING: Here Be Spoilers <<<
Trivia items below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- SPOILER: Moustapha Akkad (the executive producer) said that the killer in H20 was not actually Michael Myers, but in fact a copycat killer, and that this would be explained in the next Halloween movie. The idea was dropped for Halloween: Resurrection (2002), which explained the reappearance of Michael Myers by revealing that he had traded places with a paramedic at the end of H20, who had then been mistaken for Michael, and was subsequently beheaded by Laurie.
- SPOILER: There was at one time a plan for Michael Myers to speak a single line at the end of the movie. He was to have said "Laurie" just before being beheaded by Jamie Lee Curtis. This idea was dropped from the final script.
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