Nicolas Roeg was originally going to direct, but didn't due to creative difference. One of his proposals was to excise the trademark cliffhangers and melodrama, seeing Flash as more of "a metaphysical messiah."
George Lucas, who had loved the old Universal Flash Gordon serials as a kid, wanted to make a modern version based on the original comic strips, but when he learned the rights were too expensive (as King Features wanted to sell them to Federico Fellini, who was optioning them at the time), he wrote Star Wars: Episode IV - A New Hope (1977) instead.
Most of Sam J. Jones's dialog was dubbed. This was due to the fact that Jones had a falling out with producer Dino De Laurentiis over lack of payment and refused to go into the recording studio to loop his lines.
In the finished film, George Harris's dialogue as Prince Thun of Ardentia was dubbed. His actual voice can be heard on the Queen soundtrack album, however, indicating that this change must have been made fairly late in post-production.
This was the first movie that the rock band Queen made the music for, in it Prince Vultan says "Who wants to live forever?". The only other movie Queen did the soundtrack for was Highlander (1986), for the movie they wrote songs including "Who Wants to Live Forever" plus many others.
Kurt Russell auditioned to play Flash Gordon. According to an interview with Russell in Starlog magazine from August 1981, Dino De Laurentiis really wanted Russell for the part, but Russell ultimately turned it down because he thought the character was lacking in personality.
During the opening credits each actor's credit is accompanied by artwork of their character from the original comic strip. Therefore you see all of the major characters as cartoons before you see the actors who play them.
The actors playing the Hawkmen couldn't sit down because the costumes would hurt their backs. Melody Anderson told Starlog Magazine, "They could never sit down, because when they did the wings would dig into their backs. When we had a rest period, you'd see all these guys lying on their stomachs with wings, like they were ready to take off. It was a very funny sight." According to Brian Blessed, he had to sit on a perch.
John Hollis plays one of Klytus's Observers, who is fitted with an electronic "imager" device in place of his eyes. Hollis also has a role in Star Wars: Episode V - The Empire Strikes Back (1980) as Lando Calrissian's aide, who has a similar distinguishing feature: a cybernetic device installed over his ears.
Dino De Laurentiis had never heard of Queen before making this film. The band was approached for the gig in 1979 and they were immediately interested in the prospect of working on a film. Their manager arranged a meeting with De Laurentiis to discuss the opportunity and he allegedly asked "who are the Queens?"
In the original script, when Flash is sentenced to death by Ming, Dale bursts out that Ming is "absolutely merciless". Ming is enthralled with the description, and immediately starts calling himself "Ming the Merciless".
According to Brian Blessed, it took about three days to prepare the Ajax sequence and put everything, including dozens of hanging Hawkmen, in place. Blessed put in his own special effects, going "pew pew pew" as he "shot" his cardboard bazooka. Because of this they had to take another day to reset. Blessed didn't feel too bad as Sam J. Jones was also a pretty hot hand with his prop gun, also filling in the "pew pews."
The movie came about when producer Lou Scheimer, seeking additional funding for his animated NBC movie of the week Flash Gordon: The Greatest Adventure of All (1982), turned to Dino De Laurentiis, who agreed to help out if Scheimer could finagle the rights for him to make a theatrical film. Impressed with Scheimer's results and the prospect of cashing in on the theatrical version, NBC shelved the animated movie for a handful of years, had Scheimer's company recut it and turned it into the Saturday morning series Flash Gordon (1979).
Klytus and Kala, Ming's two chief henchmen, were competitors for their ruler's favor. Ming played them off against each other to keep them from teaming up against him. This was downplayed in the film to keep the storyline fluid.
For a scene where Dale turns into a giant spider for a dream sequence, Melody Anderson spent six hours getting painted green, wearing fake eyes and fangs with a head piece that weighed over 20 pounds. When Mike Hodges came in, he said, "This is wonderful! But we can't use this, it has absolutely nothing to do with the script.
In the original script, Flash and Dale first meet at a Canadian resort called Dark Harbor. Although they flirt with each other, they don't become acquainted until they're sharing the ill-fated plane ride to New York City. Dale later talks briefly about Dark Harbor during her tear-filled meeting with Flash before his execution.
According to Sam J. Jones, while filming the tilting-disc fight scene, the actors would get covered in paint by the disc that was spray painted silver. They would have to take extra time between each take to wipe silver paint off their bodies.
Lorenzo Semple Jr. was pressured to make the film funny even though he says now was "a terrible mistake." He said, "Dino wanted to make Flash Gordon humorous. At the time, I thought that was a possible way to go, but, in hindsight, I realize it was a terrible mistake. We kept fiddling around with the script, trying to decide whether to be funny or realistic. That was a catastrophic thing to do, with so much money involved... I never thought the character of Flash in the script was particularly good. But there was no pressure to make it any better. Dino had a vision of a comic-strip character treated in a comic style. That was silly, because Flash Gordon was never intended to be funny. The entire film got way out of control."
The script was translated into Italian by a woman who Lorenzo Semple Jr. described as a "horrible" translator. He gives an example saying if it said, "The tall, beautiful woman walked into the room," she'd say, "Oh, what a beautiful cat." Semple complained but Dino De Laurentiis said, "I do not want to be fooled by the words; I do not want to be fooled by written words. I want to know the story."
Dr. Zarkov's backstory was that he was a NASA scientist who was fired for his paranoid fantasies that Earth was going to be attacked from outer space. Sixty Minutes (1983) derided him as "A Poor Man's Billy Mitchell".
According to the book Dino: The Life and Film of Dino De Laurentiis, Sam J. Jones kept getting into fights during the filming of the movie - at one point, Jones was in the hospital with a big scrape on his face, and De Laurentiis himself barged into the operating room to make sure they fixed his face so as not to leave a visible scar. But Jones kept causing trouble, and then at Christmas, he left for Los Angeles and never returned - so De Laurentiis recalls that he told Mike Hodges, "We'll keep going, with the very best stand-in you can find."
In the original comic strips, the character known as Kala was the King of the Shark Men (from the undersea kingdom of Mongo), rather than the German-accented female general of Ming's forces played in the movie by Mariangela Melato. Likewise, Prince Thun was the King of the Lion Men of Mongo in the strips (and in the Universal serial), unlike the more human character George Harris plays in the movie.
A comic book adaptation of the film was drawn by artist Al Williamson, who had previously worked on Flash Gordon comics in the 1960s. Williamson actually disliked the movie, especially the casting of Sam J. Jones, whom Williamson felt did not resemble the classic character.
Max von Sydow would later have small roles in the science fiction films Dune (1984) as Dr. Liet Kynes and _Star Wars: The Force Awakens (2015)_ as Lor San Tekka. The "Flash Gordon" serials of the 1930s, which this is film is a remake of and the science fiction fantasy novel "Dune" by 'Frank Herbert' (I) were considered to be 'George Lucas (I)'s influences behind the "Star Wars" films.
"Flash Gordon" was photographed by veteran British cinematographer Gilbert Taylor, who had been the DP on Star Wars: Episode IV - A New Hope (1977). Taylor's distinctive camera work, which has a dreamlike, hazy look emphasizing the fantasy element (accomplished with the use of filters) is in full effect on "Flash Gordon."
Richard O'Brien found the whole experience of making the film tedious. He did, however, get a lot of pleasure from sitting in the personalised chairs of the principals. His impish behaviour wasn't curbed at all; he knew Mike Hodges very well, much to the consternation of the stars who regularly bitched about him on set.
35 years after the film's release, Max Von Sydow made a cameo in Star Wars: The Force Awakens (2015) as Lor Tan Sekka. The Flash Gordon serials were one of George Lucas's influences behind the Star Wars films. George Lucas attempted to make the Flash Gordon film in the 1970s but was not able to acquire the rights.
In the movie, the moon steadily approaches Earth to collide with it (as per Ming's grand plan). Near the end, Flash watches a countdown clock measuring the time left before the collision and manages to save the day just SECONDS before impact. In reality, this means the Moon would stop it's approach within a small distance to Earth, perhaps mere miles or thousands of feet. The proximity of the Moon to the Earth would result in such devastation due to the mutual gravitational fields of the two large bodies overlapping that in all likelihood all life on earth would still be destroyed.
The trivia item below may give away important plot points.
A scene from Doctor Who: Last of the Time Lords (2007), which a unidentified hand is seen picking up the ring of The Master at his funeral pyre, which The Master's evil laugh is heard mirrors the final scene of this film.