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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.

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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).

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Trivia: The film had several different working titles, including "Halloween: The Revenge of Laurie Strode."

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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.

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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.

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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.

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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.)

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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.

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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.

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