Other mistake: When the characters go to the Himalayas, the whole time, like for 20 mins, including the confrontation scene, they are all wearing casual, short-sleeved shirts. You can see Mr. Burnish's henchmen wearing winter clothing, while the main characters don't freeze to death. They only start getting cold after a long time.
Other mistake: The gun choreography in the fight at the Hound Dog just sucks. Nevada picks up the now zombiefied Albuquerque's gun, a Mini Draco AK with a (at most) a 10 round magazine, can barely hold it up but longarms it like a handgun and *brrr* fires at about double the guns actual fire rate. Infinite ammo, zero recoil (with a small stature woman firing 7.62x39 with one hand no stock) and the entire time she's shooting, the gun is pointing right at Tallahassee's head. (01:01:55)
Other mistake: When Jenny and her friends are in the grocery store, they grab string cheese from a shelf that isn't refrigerated - it is just a random shelf and the cheese just stands out as so wrong.
Other mistake: When Ki-jung is making the fake diploma, the date she uses is June 16, 2018, indicating the movie takes place after then. In a later scene, when Yeon-kyo texts Ki-taek to meet in the sauna, the date on the text is June 12, despite being a later date. (00:11:20 - 00:44:40)
Other mistake: When Tom checks his phone and tells Charlotte that the president is looking for her, his phone is upside down. (01:30:00)
Other mistake: Nick Spitz shows the flight attendant his shield to gain access to the first class cabin. The shield is an NYPD patrolman shield. However, Nick is later identified by another character as an NYPD sergeant. (01:24:10)
Other mistake: The opening (like most of the movie) does not make much sense, so you can pick your kind of mistake here; the special effects are cartoonishly bad throughout the big firework explosions. When John Abraham is knocked through a window by a rocket (which takes off with a 270° turn without even rising) to the face, he gets up unscathed and starts screaming for Junky and Chandu. The camera moves from them to him and he's running with the girl in the red costume in front of him (which was way behind, safely, when he crashed through the window, so already that is wrong), and then there's a wider shot. In that shot, you can tell that Adams is bumping into the same people as before and the distances between the extras are all wrong. (00:06:35)
Other mistake: When the characters return to the real world, they all arrive at the same place at the same time, whereas in the previous movie "Jumanji: Welcome to the Jungle", it's established that the characters return to the real world at the point in time that they entered the game.
Other mistake: Whenever a cat puts a hat on, there are no cuts for the ears to pop through. Instead, the ears simply swap from being on the cat to being on the hat between frames. Sometimes, when the cat's head is a bit too high, the ears on the hat are sometimes slightly misplaced.
Other mistake: The Burglar (while tied to a chair and talking about "My Darling Clementine") says, "Apex of Ford's art, you feel me?" Vikar (James Franco) responds, "I feel you." The movie starts in 1969, but rapper E-40 (Earl Tyrone Stevens, Sr.) - "slang master" - supposedly created the expression "you feel me" in the early 1990s. (00:19:53)