Other mistake: The Angels do a clean sweep of all the bad guys, tie them up and put their heads in bags. It's kind of a plot point that they have all the baddies perfectly packed up and ready for delivery. However when Bosley makes his entrance, there's a guy in the elevator he leaves behind, the door closes and nobody 'bags' and/or ties him up. He's just unaccounted for. (00:05:10)
Other mistake: At times when everything was covered in ashes, Jeeps being driven over ashes had clean tires (black tread). One Jeep that was airborne for a couple seconds (coming out of a fire) had clean tires, but the tires later got dirty. (01:04:27 - 01:09:46)
Other mistake: It's been established Rambo was born 7/6/1947. When we see his driver's license, his DOB is 12/4/1950.
Other mistake: Throughout this, a running gag is that Fred can't drive stick/clutch. However, in "What's New, Scooby-Doo?" Series 2, Episode 6 "A Scooby-Doo Halloween," he yells at Shaggy that he's riding the clutch too hard at the beginning of the episode. If the Mystery Machine has a clutch mechanism, he would know how to drive stick/clutch.
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.