Aimee Mann's music inspired Paul Thomas Anderson to write the script and at least one lyric (and possibly more) from an Aimee Mann song was lifted and used as dialogue. In the song "Deathly" the lyric goes: "Now that I've met you / Would you object to / Never seeing / Each other again". In the film, Melora Walters's character says "Now that I've met you, would you object to never seeing me again?"
The title "Magnolia" not only refers to Magnolia Blvd in LA, where much of the movie takes place, but is also similar to the term Charles Fort (who is referenced many places in this movie) coined for a hypothetical region where things that fall from the sky come from - "Magonia".
One of the books Stanley is reading at the library is about scientist Charles Fort, who is noted for his work expanding the boundaries of scientific research to include strange phenomena such as those featured in the film.
Director Paul Thomas Anderson is the son of former ABC-TV announcer Ernie Anderson, who started his career as a Cleveland late-night monster-movie host named "Ghoulardi". Paul Thomas Anderson's production company is called Ghoulardi Pictures. One running Ghoulardi gag was to make fun of Parma, Ohio, a Cleveland suburb known for its Polish population. Philip Seymour Hoffman's character is named Phil Parma. One of Ghoulardi's catch phrases was "Stay sick!" When Donnie Smith (William H. Macy) remarks to Thurston Howell ('Henry Gibson') that he is sick, Thurston replies, "Stay that way."
Along with the scenes further explaining The Worm, there were many other scenes and dialogue exchanges included in the script but not used for the final film, including: - A scene in which Jimmy talks with Paula, the dancer he is sleeping with in the opening credits. - Extended dialogue between Gwenovier and Frank, about "Subjective human experience and terrible things", which was referenced in the final cut but not shown. - A brief dialogue between Jim and Claudia after he asks her on a date, in which they both find they have the same favorite restaurant. - We see what happens to Stanley between the events of that day's game show, and him talking to his sleeping father. - Further explanation during Earl's monologue concerning the reasons why he mistreated his first wife. - The tone of Frank's confrontation with his father is considerably different, with him showing less hostility, more genuine sympathy and concern, and attempting to wake him up. - It is made clear in the script that Jimmy doesn't survive the fire in his house caused by the destroyed television. - We see Marcie's confession for what happened to the "guy in the closet".
The trailer for the movie features shots filmed especially for it, featuring each character, in a specific location from the film in which they where prominently featured, looking directly at the camera and saying their name. They are (in order): Stanler Spector in the library, Jimmy Gator on his show's set, Donnie Smith in a dentist's chair, Earl Partridge in his death bed, Frank "TJ" Mackey in the interview chair, Linda Partridge in her car in the rain, Phil Parma at Earl's front door, Rose Gator in her car at an intersection, Claudia Wilson Gator at the restaurant, Jim Kurring at the police station, and a frog sitting on the green light of a traffic light with a magnolia flower rising and blocking it out. Ricky Jay narrates the trailer.
The credits for the "What Do Kids Know?" game show give the web address www.wdkk.com which led directly to the movie's official website. The web address "www.seduceanddestroy.com" led to the film's official site, too. Both these links are now dead.
The Mason symbol is on various walls in the WDKK studio. When Jimmy Gator's producer puts his hand on his shoulder, before the show starts, we see he is wearing a ring with the Mason's symbol on it. Similar to the Masonic farewell, "We met upon the level and we're parting on the square", the phrase is a Kipling quote, "tried on the square" is part of the official Masonic farewell. One of Stanley's library books is "A History of Masonry". The 82nd Mason lodge (8 and 2 being prominently featured throughout the film) is located in Magnolia, Arkansas.
In one of the early versions of the script, Paul Thomas Anderson proposed making it clear to the audience that all the events took place in a very small area, like one square mile or ten square blocks. It was later decided this would take too long to clarify and would confuse people.
During the end credits of "What Do Kids Know?", the final production note is that the program was a Partridge Production, referring to Earl Partridge. The only other reference to Earl as a television producer comes from his son Frank Mackey during his interview with Gwenovier. When asked about his parents line of work, Frank responds that his father worked in television and that his mother was a librarian.
When Paul Thomas Anderson approached George C. Scott about playing the role of Earl Partridge, Scott threw the script across the room, saying "This is the worst fucking thing I've ever read. The language is terrible."
The murder of Edmund Berry Godfrey mentioned in the prologue in actual fact occurred on 12 October 1678 and the three men (Green, Berry and Hill) executed for the murder were done so on evidence provided by Miles Prance, who later pleaded guilty to perjury. The mystery is still unsolved.
According to Thomas Jane, he was supposed to play two different characters in the film. But the scheduling overlapped with Under Suspicion (2000) so he was only available for the brief cameo as the young Jimmy Gator.
Paul Thomas Anderson:
The very first story of the prologue is shot like a silent film. The first shot opens with the Iris In technique, used frequently during the silent film era to open and close shots.
The trivia items below may give away important plot points.
The numbers 8 and 2 appear frequently throughout the film: - The first weather forecast: 82% chance of rain. - The gambler in the prologue needs a 2 in blackjack, but instead gets an 8. - The coil of rope on the roof when Sydney commits suicide. - One of the posters held up in the 'What Do Kids Know' audience. - The movie poster at the bus stop on Magnolia Blvd. - The placard on the third hanged convict. - Jim Kurring's box number at the date hot line. - Sydney Barringer's mother and father's apartment number is 682. - The forensic science convention starts at 8:20. - Delmer Darion flips over a stack of cards to reveal the 8 through 2 of diamonds. - Right after Jim Kurring sees Donnie Smith climbing up the building, you can see a flash of a sign on the side of the road that says "Exodus 8:2" (it's visible again when the frogs fall and hit Kurring's car) - The number on the fire fighter's plane. - In Marcy's mug shots, her criminal record number is 82082082082. - In the Smiling Peanut bar, there is a chalkboard visible with two teams, The Frogs and The Clouds, and the score is 8 to 2. - Spray painted on the cement as graffiti next to Dixon. - The kids were two days away from entering their eighth week as champions. - Quiz Kid Donnie Smith won his 100, 000 dollars on 28 April 1968. - The first two numbers of the Seduce and Destroy Hotline (1-877-TAME-HER) are 82. - Claudia proposes 8:00 for a date with Jim, but Jim says he doesn't get off work until 10:00, so the date is set for 10:00, 2 hours later than the original suggested time. - At the police station in the beginning of the movie, the clock says 8:02. - When Donnie enters the Smiling Peanut bar, the song "Goodbye Stranger" is playing. We hear the song playing from exactly 28 seconds after it's started. - Frank says "Respect the cock, and tame the c*nt" which is 8 syllables, and then right after says "Tame it!" which is 2 syllables.
The furniture store and Mobil station next to it (where the frogs scene is shot) is at the corner of Sherman Way and Reseda Blvd., in Reseda, California, about a block away from the disco club seen in Boogie Nights (1997).
Paul Thomas Anderson has said that he was unaware that the story of frogs falling from the sky is in the Bible (he took it from Charles Fort's writing) when he wrote the screenplay. The Bible story of the plague of frogs was brought to his attention by Henry Gibson prior to filming. After he became aware of the story, Anderson worked references to Exodus 8:2 into the movie.
When the frogs are falling, we see a caption on a picture in Claudia's apartment, "but it did happen". And it did. This happens when storms pass over a lake teeming with frogs, picking them up and dumping them elsewhere. This happened in the town of Villa Angel Flores in Mexico after a tornado picked up a cluster of toads and dropped them over the town one evening in June, 1997.
Character Jimmy Gator, a quiz show host, claims that "the book says, we might be through with the past, but the past ain't through with us." The reference is to the opening sentence of The Natural History of Nonsense, a book debunking superstitious beliefs published in 1946 by Bergen Evans, a professor of English at Northwestern University. Prof. Evans served as the host of several TV quiz shows in the 1950's (Down You Go (1951), It's About Time (1954), and Super Ghost (1952)). Among many other topics, Evan's book discusses the belief that it sometimes rains frogs, an event that features prominently in the movie.
Following the Exodus 8:2 theme that is throughout the movie, just before the attempted suicide of Sydney Barringer, to his left below his feet against the wall, wire is coiled up forming the number 8:2.