- Actor Allusion: Bethany says "Class is in session" when Martha is inspired enough to ask her for pointers on how to flirt, alluding to Jack Black's role in School of Rock. This line is also almost the same as a lyric from the climactic song in the same film: "Class is in session"/"Recess is in session".
- Approval of God: Chris Van Allsburg, author of the original Jumanji book, called Welcome to the Jungle, "...an amusing and entertaining ensemble piece."
- California Doubling: The jungle and waterfall scenes were shot in Honolulu and Hilo, Hawaii.
- Dawson Casting: Averted with Martha (Morgan Turner was 17 during filming). Downplayed with Spencer and Bethany (Alex Wolff and Madison Iseman were 19 during filming). Played ridiculously straight with Fridge, as actor Ser'Darius Blain was not only 29 during filming, but is actually 8 months older than Karen Gillan.
- Dyeing for Your Art: Karen Gillan had to keep in shape, endure difficult fight choreographies, and was a target of mosquitos given the fake tan meant she could not be sprayed with repellant. Hey, at least she got a Lampshade Hanging out of it.
- Fake American: Scottish Karen Gillan puts on a rather convincing American for the role of Ruby Roundhouse.
- Licensed Game: A mobile game based on Jumanji was made as part of the film's promotion - ironic, as an early draft featured Jumanji as a minigame format. It can be seen here.
- Playing Against Type: A lot of the film's humor comes from the actors playing the high school characters they were before being pulled into Jumanji, like Dwayne Johnson as a nerdy germophobe who keeps screaming at things. Apparently Jack Black had a persona all prepped up in his head for a ditzy teenage girl but never imagined he'd need to use it. Karen Gillan of course had to play a meek teenage bookworm who was a complete fail at flirting with men. And even though self-deprecation of his size is exactly Kevin Hart's style, he still had to pull out an extra stop physically to act like he wasn't actually used to being 5' 3".
- Promoted Fangirl: Karen Gillan is a huge fan of the original movie, and reportedly dropped her glass of wine upon seeing she was invited to do a new one.
- Remake Cameo: In the Japanese dub, Nigel is voiced by Masashi Ebara, who voiced Alan Parrish in all four dubs of the original film.
- Similarly Named Works: This is the second movie that Dwayne Johnson has starred in called Welcome to the Jungle.
- Sleeper Hit: The film is surprisingly successful for a sequel very few believed in, with a worldwide gross of over $960 million by the end of its 24-week run.
- Those Two Actors:
- Throw It In!: According to an interview, Jack Black improvised Bethany's "I can't even with this place" line.
- Karen Gillian really was slapping at mosquitoes most of the time, and improvised her complaint about skimpy clothes.
- What Could Have Been:
- Sony actually had a Jumanji sequel planned for a 2000 release, with Visual Effects Supervisor Ken Ralston promoted to director. Apparently, it would have involved the President of the United States getting sucked into Jumanji, then teaming up with hybrid animals, to take control of the US back from Vice President Steve Buscemi. While Ralston stepped down before filming could actually begin, the Jumanji DVD Commentary still references a sequel directed by him.
- The original script had Spencer already aware of the existence of Jumanji, because it was a mass-produced video game from the 90s that was recalled for being too dangerous and addictive.
- Tom Holland had originally been cast to be "Seaplane McDonough" (Alex's avatar), but he had to drop out due to scheduling conflicts with Spider-Man: Homecoming.
- In an earlier script, Spencer and Martha would Choose to Stay in Jumanji as their avatars.
- Word of Saint Paul: Jack Black believes that the Jumanji gameboard is alien technology or "some crazy jungle medicine man magic".
Trivia / Jumanji: Welcome to the Jungle