Trivia: The trivia and in jokes abound in this film. Firstly, you have Janet Leigh (Jamie Lee Curtis' mother) playing Norma (reference to Psycho) and complaining that the "showers are blocked again" (second reference to Psycho). In her last scene in the film, Janet Leigh is about to get into and drive away in the same car that she used in Psycho.
Trivia: Janet Leigh not only gets into the same make and model car as "Psycho" but it also has the same license plate number: NFB 418.
Trivia: Late in the film, before Laurie/Keri goes back inside to battle Michael alone, she tells John and Molly to "drive down the street to the Becker's". This is a reference to "Scream," in which Casey Becker's father told her mother to go "down the street to the Makenzie's", a line included in the original Halloween.
Trivia: In Halloween H20, Laurie Strode changed her name to Miss Tate, this name also refers to Sidney's teacher in Scream, when the police are interrogating students. Check the Scream movie for the teacher's name. (00:18:46)
Trivia: Early on in production, this was intended to be the final "Halloween" film, with director Steve Miner and star Jamie Lee Curtis wanting to give the series a definitive ending in which Laurie triumphs over the "boogeyman" Michael Myers. Shortly before filming began, one of the producers exercised a clause in his contract for the series and informed Miner and Curtis that he would not allow them to kill off the Michael Myers character. Both Miner and Curtis nearly left the project, with Curtis in particular voicing her disdain over the decision. But eventually both chose to stay on, with Curtis reasoning that as far as her character Laurie was concerned, she kills the "real" Michael Myers in the end. Curtis only appeared in the following film "Resurrection" out of a begrudging respect for the series, wanting to give the character a proper send-off. Curtis has subsequently stated that 2018's "Halloween," a direct sequel to the original that ignores every other sequel including "H20" and "Resurrection," felt like a much more appropriate way to bring her character back into the "Halloween" universe, and is her preferred follow-up to the original.
Trivia: One of the biggest hurdles of the film? Oddly enough, it was choosing the right design for the mask. Director Steve Miner originally wanted a more stylized, paper-white mask and several scenes were shot with this original design. However, the producers felt the mask didn't look right and wasn't menacing enough, and thus the design was changed into one based more around the look of the mask from the previous film ("The Curse of Michael Myers") and included more detail and shading. Director Miner protested, but his attempts to go with his first design were vetoed. Nevertheless, the original mask can occasionally be seen in the film for some scenes they didn't want to reshoot (mainly sequences with Michael in the distance), and in some of the trailers.
Trivia: Not a mistake, just something to notice: When the guidance counselor is checking on Molly and Sarah, they are watching Scream 2, the scene where Cici (Sarah Michelle Gellar) gets killed. As he enters the room and says their names, watch the TV. As he says "Sarah", Sarah Michelle Gellar turns around.
Trivia: Originally composer John Ottman wrote an entirely different score for the film - one that was more whimsical and less traditional. The producers panicked at the last minute, feeling much of the score didn't work for the film, and had to bring on fellow composer Marco Beltrami to write new music to fill in the gaps. Unfortunately, due to the limited time, Beltrami could only write minimal original music for the film, and thus cues from some of his other scores (notably "Scream" and "Mimic") were recycled and reused in the film.
Trivia: In the first movie, Laurie sees Myers while she is looking through a window during school. The teacher surprises her by asking her a question and her answer is about fate. When she looks back out the window Myers is gone. In H20 Molly is looking out a window during school, she sees Myers, Laurie asks her a question and her answer is about fate. When she looks back out the window Myers is gone.
Trivia: If you look past the nurse when she goes next door to where the two boys live and knocks on the door before asking them to check her house, you can see the fat cenobite with the sunglasses from the first two Hellraiser films sitting on the bench on the porch. It's just a mannequin, but it does look impressively detailed.
Trivia: Joseph Gordon-Levitt is wearing a hockey mask in the opening scene, which frightens Marion. This is a nod to the character Jason Voorhees from the "Friday the 13th" film series. "Halloween: H20" director Steve Miner got his start working on the early "Friday the 13th" movies and even directed the second and third films.
Trivia: The film was originally written to be a low-budget, direct-to-video feature, with Michael being the only returning character. When Jamie Lee Curtis expressed interest in returning to the "Halloween" franchise in honour of the first film's 20th anniversary, the script was drastically re-written to include her character Laurie Strode, and the movie was upgraded to a theatrical release. It paid off, with "H20" becoming the highest-grossing film in the series to that point (in unadjusted dollars).
Trivia: The film had several different working titles, including "Halloween: The Revenge of Laurie Strode."
Trivia: The original story treatment ended in a massive car chase involving a police helicopter, with Michael ultimately being decapitated and chopped up by the helicopter's blades when it crashes; but this was changed entirely to a more traditional, intimate one-on-one battle in rewrites.
Trivia: Jamie Lee Curtis and director Steve Miner tried to get actor/comedian Mike Myers to cameo in the film as a joke (since his name is the same as the killer), but he politely turned them down.
Trivia: The two detectives seen at the start of the film originally had much larger roles in the script. (Albeit, one was a female detective in the script.) They would track Michael Myers to California and appeared in several more scenes. However, their subplot was cut during rewrites, since it wasn't strictly necessary.
Trivia: Dr. Loomis' dialogue during the opening credits was done with a soundalike (famous voice actor Tom Kane), because the studio could not locate any unmixed audio of Loomis from the original film. All of the audio they could find had music and sound effects hard-mixed into it. (Ironically now, a little over twenty years later, isolating mixed dialogue and getting rid of music and sound effects is incredibly easy with cheap software.)
Trivia: Executive producer and uncredited co-writer Kevin Williamson wrote a scene acknowledging the events of "Halloween" 4-6, where it would be explained that Laurie faked her death in the car accident mentioned in "Halloween 4" to go into hiding and protect her daughter Jamie. She would learn about Jamie's death (seen in "Halloween: The Curse of Michael Myers") and be grief-stricken. However, the scene was removed from the script, and the film was retooled to ignore every movie except one and two.
Trivia: When the film opens with the 50s tune "Mr. Sandman" over the soundtrack, it's not just a simple reminder of 'Halloween II', but a signal that this film is continuing from 'Halloween II' rather than its immediate predecessor 'Halloween: The Curse of Michael Myers'. As "Mr. Sandman" was the last thing heard before 'Halloween II's closing credits, 'Halloween H20' in effect picks up where 'Halloween II' left off.
Chosen answer: There is no answer to that. Its simply bad work by the writers. They never tried to explain that. You could perhaps assume shock had prevented the paramedic from immediately taking the mask off. Unlikely though,.