When the EMTs are pulling the woman bitten by a mosquito out of her car, she is wearing boots that come to mid-calf. In the next shot when they are putting her into the ambulance, her legs are bare and she is wearing pumps on her feet.
After the brakes go out in the police car and it crashes into the store, the policeman simply refills the master cylinder with brake fluid to fix the brakes. The previous scene showed that there was a hole in the line that released fluid, which would cause the brakes to not work again, yet the policeman continues to use the brakes with no ill-effect.
There were 34 spaces on the game for Alan from start to finish, including the center, but Alan couldn't have finished when he did, since his rolls were: 5~?~7~3, and the second roll couldn't have been any higher than 11, because if he rolled 12 it would've been a double.
When Alan, Judy and Peter are in the car, the mosquito outside cracks the windshield. But after they start the car and park it outside Alan's home, the crack disappears.
After Alan shaves for the first time, there are cuts and pieces of tissue on his face. In the next shot, there are no cuts.
Most of the hard-hats worn by the construction crew (where Alan finds the buried trunk) are of much more modern design than any which would have been used in 1969. Hard-hats were not as commonly worn then as they are now, after their use was mandated by OSHA, which was not created until 1971, two years after that scene takes place.
When the paint cans all fall onto Van Pelt, he is shown having color splotches all over him. When paint is at a store, it is white until color is mixed into it.
One of the two monkeys in Carl Bentley's police car right before they take off turns the ignition key to the ON position without turning it all the way forward to presumably start the engine, and then puts the car into gear and hits the gas pedal. The only way to start a car engine is to turn the key all the way forward past the point of putting the key in the ignition into the ON position and then let go if the start-up is successful. The car used in this scene is a 1991-92 Chevrolet Caprice with fender skirts covering 1/4 of the rear wheels, and GM's brake-shift interlock feature wasn't made standard for their vehicles until the 1995 model year.
When Carl detains Alan, Van Pelt shoots at Alan with a suppressed rifle but misses. No suppressor is capable of silencing the speed of a bullet and its impact, which should have alerted Alan and Carl.
The liquid from the jug of laundry detergent that Peter spills on the floor in Sir Sav-A-Lot to set a trap on Van Pelt is shown to have a lime green dye. Laundry detergent liquids in reality only use blue dye for the standard products where the only other color option is clear for the dye-free alternatives of said products.
(at around 28 mins) After Peter rolls a five which will release Alan, the message reads "His fangs are sharp, He likes your taste, Your party better move poste haste".
'Post haste', or 'post-haste' is an expression meaning quickly and is derived from markings on mail, it shouldn't have the 'e' at the end of 'poste'. However, the game is well over 100 years old, and spellings often change over time. Furthermore, this may be British English from the African continent rather than American English.
When the mosquito is on the windshield, Alan refers to it as "he". Only female mosquitoes bite, not males. However arguably, many people do not know this and considering Allan never even finished the sixth grade, it could be presumed that he didn't know either (or the other two children for that matter).
When Alan handcuffs Carl to the cop car door and begins to walk away, he throws the keys into the adjacent field. Alan then hears a radio call over the police radio of the hostage situation at the store. Alan runs back to the cop car, gets in and starts the car without retrieving the keys from the field. However, as Alan tosses them, Carl yells, "My handcuff keys!" indicating they were only for this purpose and that a different key starts the car.
A lion comes out of a jungle-themed board game. Lions do not live in the jungle, they live on grassy plains. But Jumanji is a fantasy world where biological facts like this can be bent for dramatic purposes.
When it is Alan's turn to roll the dice and the clue he reads releases Van Pelt from the game, he's afraid and terrified and calls Van Pelt by name as if these two characters have crossed paths during Alan's time trapped inside the game (which they probably did). Yet later when Sarah tells him that he could've told them that Van Pelt existed in the game and that he hunts people, Alan says "Well I didn't know, okay?! It's just a roll of the dice!", even though he clearly reacted with fear because he knew who/what exactly was about to come out of the game and come after him. However, he is clearly being sarcastic, most likely to move the conversation along so as to get back to the game.
The slow rhino seen at the back of the stampede at 1h 45m 4s was an animation error they left in. An incorrect frame rate had been set for the element, making it run slower. They kept it in, whilst adding the foot stomp and wheezing sounds.
When the floor starts to split apart, the "wood" around Alan's chin bends as if it were made of rubber.
After Van Pelt gets knocked over with the shelf of paint cans, Sarah grabs the Jumanji game from the pile. The paint cans sound empty.
The crocodile at one point bites down on Sarah's foot, yet she does not react or suffer from any injuries.
When Peter is dragged away by the vine, he stops slightly before the others grab him.
In 1969, Carl shows Alan the training shoe he's been working on for almost a year. However, it's not a prototype, but a finished shoe representing many man years of development, using 1990s materials.
Although the film says Carl invented the trainer in 1969, it was actually invented by Henry Nelson McKinney in 1917.
The majority of characters in 1969 are depicted with hairstyles that were in vogue during the early to mid 60s which later went out of style in the late 60s not long before the setting of these scenes.
When Alan returns home after finding the game, the grandfather clock can be heard chiming at a fairly slow pace. Later, when the clock chimes again and startles Alan, it is not the same chiming sound, and the pace is much faster.
After the stampede Van Pelt walks through the house. There is debris underfoot. As he walks across the litter his right foot creates a tick-tock sound from the broken tiles. The sound is repeated on the next fall of his right foot. This is evidence of a Foley artist's work.
When Aunt Nora gets back inside her car after watching the stampede crossing through the intersection, she appears to be starting her car's engine, but no sound of her car's engine starting up is heard when she does this.
When the aunt flags down Carl to ask for a ride home, a filming location police checkpoint can be seen further up the road with a policeman standing outside of a police car.
When Alan helps Judy down from the chandelier, a hand appears to the right of the screen. A crew member was at the side to help steady Kirsten Dunst when she was set on the ground.
Reflection in the grandfather clock when it chimes and Alan is startled by it.
Reflection in the metal door when Sarah is being chased out of the Parrish home by the bats.
Just before the monsoon, the string moving Peter's tail is visible.
The majority of animals that come out of the jungle-themed board game actually live in the Savannah. This includes lions, African elephants, black rhinoceroses, and zebras.
At about 1 hour and 5 minutes in, as Carl is driving with Alan, tall, rocky snow-capped mountains can be seen through the rear windshield - out of place for the New Hampshire setting. The trees also change from autumn browns to vibrant greens in the next shot.
Sarah Whittle's house and its surroundings in the movie is shown to be in a rocky region as a sign this scene in question was not filmed in New Hampshire despite the movie's setting.
All the animals in the herd of elephants, zebras, rhinos, and such seem to always stay together as they run at different speeds. Do the zebras and smaller animals constantly stop every now and then to let the others catch up?
In 1969, a swarm of bats released from the game chase Sarah out of the Parrish mansion after Alan is sucked into the game; and they all leave the building as the door closes. 26 years later after Aunt Nora buys the mansion with Judy and Peter moving in with her, one of them remains in the mansion and in the attic without an explanation.
When Van Pelt finally gets a chance to shoot Alan, he's using a gun and bullets from a 1995 gun shop and not the one he was using when he appeared. As such, the bullet should have continued and struck Alan. The gun should have remained as well after everything from within the game returned.
Aunt Nora calls her household until discovering it's Judy whom (alongside Peter) were ditching school due to the board game they were lured into by the drumbeats from earlier on that they discovered into the attic. However, there was no prior explanation on how Aunt Nora would have received a call from the school about Judy and Peter's absence - leading to calling the household to confirm that they weren't in school, due to the game.
When the game is played in the attic Judy tells Sarah that she can win if she rolls a twelve, but she only rolls a three. On her next turn Alan says she can win with a seven; however, 12 minus 3 means she would have needed a nine.
Alan's comment about the difference between alligators and crocodiles is incorrect. The two are in different families and alligators are only found in North America and China. Only crocodiles are native to Africa. (The ONLY place in the world where the two are found together is in South Florida, and even there they occupy different habitats.) The actual visual differences are in the dentition and the shape of the snout. Alligators have a rounded, blunt snout and crocodiles have a more triangular one. The model in the film is a crocodile.
When Alan asks Carl what year it is, Carl thinks he's asking about his car, and he said it was brand-new. When Judy clarifies, she states the current year is 1995. Carl's car is at least three years old when this movie takes place, since the Chevy Caprice's skirted rear wheel wells were replaced with rounded wheel wells on models after 1992 so the car is not brand-new.
When Van Pelt goes to the gun shop to request new bullets for his original gun, he demands a new gun after the clerk tells him that exactly that model of ammo has been discontinued since 1903. However, the clerk is incorrect. As Van Pelt's original gun is a modified Winchester Model 1901 rifle, the bullet depicted when set on the desk is clearly a Winchester No. 10 brass shot shell. Said model of ammo was introduced in 1879 and was actually not discontinued until 1949.
When Alan finds the game, he finds it in the dirt wall at the construction site near the factory. When Sarah asks Alan where he found the game, he tells her he found it inside the factory.