Continuity mistake: At the construction site, Alan claws through the mud, to get to the large metal box. His fingers get covered in mud, yet as he pulls the box out of the mud, and in following shots, the tops of his fingers and his fingernails are very clean. (00:07:00 - 00:07:50)
Continuity mistake: When Alan is eating dinner, and his father is shouting at him, the fork and knife on Alan's dinner plate moves around between shots. (00:09:40 - 00:11:00)
Continuity mistake: When Alan's dad enters the car, he turns it on, yet you don't hear the engine start. When he shifts gears, you finally hear it start. (00:11:15)
Continuity mistake: After being startled by the grandfather clock, Alan drops the dice on the board. Between a wide shot and a close-up of the board, the location of where the dice fall changes greatly. They have also moved when Alan gets sucked into the game. (00:13:20 - 00:14:15)
Continuity mistake: When Alan drops the dice, after being startled by the clock chimimng, one die reads 3, the other 2. Yet when his board piece starts to move, you can see both of the sides of the dice, both reading 2. (00:13:25)
Continuity mistake: After Peter discovers the bat in the attic, he runs downstairs screaming, and you can see a chair by the door of the attic with a white cloth sitting on it. However when Aunt Nora walks upstairs, there is no sheet on the chair. (00:18:00)
Continuity mistake: In the attic, Peter takes the Jumanji pieces out of the compartment, then closes it. Then when he takes the dice out the compartment, the compartment lid is open, not closed, and no-one touched it. (00:24:00)
Continuity mistake: When Peter rolls the dice prior to letting the monkeys loose, whilst him and Judy are in the attic, he rolls both "1"'s. The sides of the dice which are visible read "3" on one die and "4" on the other. Then when it cuts to a closeup of the boardpiece moving, the "4" now reads a "2", and the dice have also moved position. (00:25:15)
Continuity mistake: When all the monkeys are in the kitchen, Judy and Peter open the door to peek inside, and a monkey throws a tomato at the kitchen door, making a big stain of tomato juice on the door. When the monkey throws the knives at the door though, the stain has vanished, and the door is clean. (00:25:55)
Continuity mistake: When the monkeys are destroying the kitchen the kids open the kitchen door and the monkey on top of the refrigerator knocks the cereal box to the floor. A few seconds later the cereal box is back on top of the refrigerator and the monkey knocks it over only spilling the contents. (00:26:45)
Continuity mistake: When the monkeys are causing chaos in the kitchen, a monkey throws three knives at the kids. Two of them stay in the door, but one bounces off and only makes a nick in the wood. Later in the film, when Robin Williams is in the kitchen, and he blocks the door, you can see that the two knives that were stuck in the door are still there, but the nick in the wood has gone. (00:27:10)
Continuity mistake: After Alan traps the lion in the bedroom, it makes claw marks in the door. The marks change greatly from the first close-up of them being made, to the second shot when Alan walks away from the door. (00:28:35)
Continuity mistake: When Judy is talking with Carl outside the front of their house as Alan examines the police car, Judy's pigtails are alternatively in front of, or behind her shoulders during shots. (00:33:00)
Continuity mistake: As Mrs. Thomas is being taken from her car, after being bitten by the mosquito, the men put her on a pedestal and you can see she is wearing long green boots that nearly reach up to her knees. Yet when they are putting her into the ambulance, she has black heeled shoes on. (00:37:50)
Continuity mistake: When the LeBaron gets hit by the ambulance, we see that it comes to a stop about 10-15 feet from the corner. When the paramedics come out to help the woman in the car, it is now right at the corner. (00:38:50)
Continuity mistake: In the scene in which an ambulance wrecks the back of Judy and Peter's realtor, the license plate on the front of their car reads DBA-454. However, in the scene where Carl finds his car wrecked into a tree, when he backs out, his license plate also reads DBA-454. (00:38:50 - 00:52:35)
Continuity mistake: When the insect sits on the windowshield of the car Robin Williams says that the insects can't make a hole, they are safe, then the insect makes a hole, the car drives away creating havoc on the road because of extreme bad driving. The car stops, they get out, then there is no hole in the windowshield. (00:40:10)
Continuity mistake: In the kitchen Alan opens the fridge and the monkey runs out. Judy is standing there and both her plaits are hanging behind her. In the next shot they are both hanging over her right shoulder. (00:41:25)
Continuity mistake: When Alan explains who he is to Sarah, she peers out through a door that's only open a crack. But when the shot cuts to Alan, his entire head and practically both his shoulders are visible through the door. When it switches back to Sarah, Alan appears to be at least two feet away (since he's totally out of the shot) and the door is still open the crack of a few inches. (00:47:20)
Continuity mistake: The licence plate on Carl's car is "G2298" but after finding the car which the monkeys had smashed into a tree, as he reverses, the plate is "DBA 454." (00:50:30)
Answer: The game is essentially "resetting reality" back to the point Alan was first sucked into the game. So it is undoing everything that has been done - including taking away the gun and bullets Van Pelt had purchased.