Tom Holland was originally cast as Seaplane McDonough, but had to drop out of the film because he was busy with Spider-Man: Homecoming (2017).
There are several incidents in the film that references (Dwayne Johnson) : During the Bazaar scene, while fighting and calling out his actions, Bravestone dispatches one of Van Pelt's henchmen by using his wrestling finisher, the Rock Bottom (a body slam move). Fridge's football jersey reads #94. Johnson was formerly a football player at the University of Miami with his jersey reading #94. Finbar says that Bravestone is 6'5 tall and weighs 270 pounds. That is Johnson's weight and height in real life. At one point, Bravestone refers to himself in third person and the other characters comment about it. One of Johnson's WWE persona "The Rock"'s character traits is speaking about himself in third person. "Do you smell what The Rock is cookin'?" Johnson's production company is called Seven Bucks. It refers to the Johnson being a world champion 7 times in his wrestling career.
In the aftermath of Jumanji (1995) actor Robin Williams's suicide, many people spoke out against this film. The crew assured that this film would provide a great tribute to Williams.
Ruby Roundhouse's outfit was influenced by Lara Croft, the main protagonist of the Tomb Raider video games. As an in-joke, Martha comments on how impractical the outfit is to wear in the jungle.
Jack Black jokes that he wasn't acting in the scenes when his character was infatuated with Dwayne Johnson's character he actually was infatuated and the cameras kept rolling.
The cast members were asked if they were able to sing a part of Welcome To The Jungle. All members did. Jack Black sang lead vocals, then The Rock and Kevin Hart joined him. Jack Black decided to perform Axl Rose's (non-forgettable, iconic) scream.
Mouse Finbar wears a little badge with the picture of a slice of cake and a line going across it, a nod to the fact that his character's weakness is cake. The badge can be seen on the lower left side of his vest
Fridge's football jersey reads #94. Dwayne Johnson was formerly a football player at the University of Miami with his jersey reading #94.
The open field scene where the cast was chased by cyclists was shot at a ranch in Hawaii, where Jurassic World (2015) was filmed. When the camera is at a particular angle, you can tell exactly what scene was used there from Jurassic World.
A poster for Uncharted 4: A Thief's End (2016) hangs in Spencer's room, whose score was also composed by Henry Jackman.
A younger Jack Black did a commercial for a video game called Pitfall. Jacks younger self wore the same hat.
All the Brantford High School scenes were shot at the same school Goosebumps (2015) was filmed, which also starred Jack Black.
The second collaboration between Dwayne Johnson and Kevin Hart. The first was Central Intelligence (2016).
Dwayne Johnson coincidentally starred in The Rundown  which was originally called Welcome To The Jungle and known as Welcome to the Jungle in other countries.
There is a scene in the movie where Dwayne Johnson's character begins referring to himself in third person and the other characters comment about it. This is a nod to Dwayne Johnson's WWE persona "The Rock" as one of his main character traits is speaking about himself in third person. "Do you smell what The Rock is cookin'?"
James Newton Howard was originally announced as the film's composer, but had to leave due to schedule conflicts.
Karen Gillan posted a photo of herself and her personal trainer, Scott Pearlman, who helped her get into shape for the film, on her official Instagram account on November 10th, 2016, and thanked Pearlman for whipping her into shape for the movie.
The 3rd adventure film set in the jungle to star Jack Black. Jack Black had starred in King Kong (2005) as the filmmaker Carl Denham, and Tropic Thunder (2008) playing an actor, Jeff Portnoy. In this film, he plays a virtual character.
Although they don't share any screentime, this film reunites Colin Hanks and Jack Black, who both starred in the 2002 comedy "Orange County." Jake Kasdan also directed both films. They also shared scenes together in Peter Jackson's King Kong.
The football player's nickname of Fridge, is a nod to American football player William Perry, who was known as "The Refrigerator", or "The Fridge".
Towards the beginning of the movie one of the characters is seen wearing a yellow raincoat standing in front of a rundown dilapidated house eerily reminiscent of the movie IT
Both Jumanji and Jumanji: Welcome to the Jungle have a connection to Raiders of the Lost Ark. Jumanji director Joe Johnston won an Oscar for Best Visual Effects for Raiders, Jumanji: Welcome to the Jungle is directed by Jake Kasdan who is the son of Raiders screenwriter Lawrence Kasdan, Tim Mathinson (Mr. Vreeke) screen tested for the part of Indiana Jones in Raiders of the Lost Ark and Jumanji: Welcome to the Jungle star Dwayne Johnson's first movie experience at 8-years-old was Raiders of the Lost Ark (1981).
A rare ex Military Land Rover 101GS can be spotted in one scene. The other Land Rover is a also milspec Defender 110s.
Young Spencer (Alex Wolff) has a number of video game posters hanging in his room and behind his door, primarily from two popular Sony titles: Uncharted 4: A Thief's End (2016) and The Last Guardian (2016).
Professor Oberon's bow tie in the film was made by a woman in Kennebunk, Maine where part of the original film was shot.
Jack Black, Colin Hanks and Jake Kasdan have worked together on Orange County (2002).
Though they had no scenes together, both Jack Black and Colin Hanks previously appeared in King Kong (2005).
Premiered at the 14th edition of Dubai International Film Festival 2017, with the stars Ser'Darius Blain and Madison Iseman on 9th December 2017.
Despite one of Smolder Bravestone's official in-game strengths being "Fearlessness," Spencer is constantly scared by various things (such as a surprise squirrel or "Moose"/Fridge acting like he's going to hit him) throughout his time in Jumanji, just like he is back in the real world.
This is the second movie, named "Welcome to the Jungle" in which Dwayne Johnson is in it.
When Spencer is played by Dwayne Johnson for the first time in the movie, he cocks his eyebrow in a strange way. This is the people's eyebrow, Johnson's signature move from his wrestling career.
35 years before the film's release, Colin Hank's father Tom Hanks starred in Maze and Monsters (1982) (TV Movie) which Hanks plays a young man whom and his group of friends play a fantasy board game which dangerously soon draws the line between fantasy and reality.
Actor Tim Matheson who plays Old Man Vreeke, proprietor of the dilapidated "Freak House" is most celebrated for his role as Eric Stratton, member of the Delta Tau Chi fraternity who lived in the "Animal House" in the 1978 comedy Animal House.