Trivia: In an interview, the director stated that hoverboards were real, but they weren't on the market because parents didn't like the idea of floating children. He said this as a joke, but this didn't stop mass hysteria as thousands of kids went from store to store looking for hoverboards.
Trivia: The sound of Vigo growling is exactly the same growl that the terror dogs from the first Ghostbusters make.
Trivia: When David Banner is dreaming about his trial, the jury foreperson is played by The Incredible Hulk creator, Stan Lee.
Trivia: In 1987 Thomas Knoll made a program called "Display", as a side project. He showed it to his brother who worked at Industrial Light & Magic, and they used Display as the basis for their own effects program, which was used to create the alien water tube. The software was refined and named Photoshop, eventually demonstrated to Adobe in 1988, who bought the rights to distribute it.
Trivia: William Shatner's contract for Star Trek IV stipulated that he would only be in that movie if he could direct Star Trek V.
Trivia: Much like the set of War of the Worlds, the set of this crash was so realistic, that airline pilots near Toronto were calling in a downed aircraft as they flew near it, unaware that it was staged for the filming of this movie.
Trivia: Gromit was originally supposed to be a cat, but it was decided that a dog was easier to sculpt from plasticine.
Trivia: In one version of the script, Martin finds another videotape of his father Seth. This tape would show Seth (who is in his part-fly form) explaining the "cure". This scene would have required Jeff Goldblum to be in make-up for five hours, and he didn't want to go through that, so he dropped out, and the scene was cut from the script.
Trivia: In the open-matte print, right after the credits, the support beams of the movie lot walls are visible, painted in blue to simulate the sky. In the theatrical version and the current Disney+ streaming movie's original aspect ratio (bottom picture), one can still see the beams for a split second after the postman puts the letter in the mailbox (though there's no way here to identify them as lot walls).
Trivia: For a period of time in the 90s, the film was distributed through bootlegs that had the logos, titles, and credits cut out, often at UFO and paranormal conferences and sci-fi conventions. This led many people to think the footage was real, especially given its extremely low budget and low-quality footage that looks like a real home movie.