Trivia: The first MCU movie to feature the word "fuck", when Quill tells Nebula to "open the fucking door", a line that was improvised on-set and kept in because it was so funny. James Gunn anticipated being told to cut it out, but Kevin Feige left it up to Gunn's discretion. Feige said the Russo brothers had a "fuck" in an early cut of Avengers: Endgame, but they "didn't want that to be their legacy, so if you want that to be your legacy, then sure." James Gunn said that just made him even more keen to keep the line in, at which Feige "laughed his ass off."
Trivia: The movie came about partially thanks to the "Super Nintendo World" theme parks. As the Nintendo World parks were to be situated in Universal Studios theme parks, Mario creator Shigeru Miyamoto met many Universal executives, including Illumination CEO Chris Meledandri, to discuss the park's creation. Miyamoto felt Meledandri was a kindred spirit due to their similar creative processes and began talking with him about making a new Mario movie. Within a few years, the project was greenlit.
Trivia: Harriet's chair in the spirit session is styled after the vehicles in the Haunted Mansion theme park ride.
Trivia: The tiny pizza being embiggened by Hank is a deliberate nod by Peyton Reed to Back to the Future Part II, where a similar thing happens. Reed directed some behind the scenes footage for that film very early in his career.
Trivia: Nicolas Cage is well-known for turning down roles if he doesn't play the lead character. However, he agreed to do this film as he's always wanted to play Count Dracula, even though Nicholas Hoult is the lead character.
Trivia: At the end of the film Audrey (Jennifer Aniston) and Nick are in the helicopter there is a piece of cloth behind them that says Vikram. Vikram is the name used by Ross on Friends (starring Aniston) for Phoebe's fake boyfriend.
Trivia: When the film was released, a big deal was made about the fact there's a 10+ year age gap between stars Jennifer Lawrence and Andrew Barth Feldman, with many expressing that they felt it was inappropriate that Lawrence was older. However, the cast and crew pointed out this as being immensely hypocritical, as Bradley Cooper is 15 years older than Lawrence and played her love-interest in "Silver Linings Playbook," which nobody complained about despite her only being only 22 at the time.
Trivia: The bottom of the alien's ladder looks the same as the part the mechanic puts in Augie's car.
Trivia: Composer Jerskin Fendrix has a cameo as the musician playing the strange instrument in the Lisbon restaurant dance scene.