Continuity mistake: When Alan confronts the lions, he stabs the knife on the floor facing a 4 o'clock position. when the angle changes it faces 6 o'clock.
Continuity mistake: When Peter's foot is trapped by the carnivore plant and is held up by the 3 guys, his jacket is alternately hanging loose or stuck under Sarah's arm.
Continuity mistake: When the cop is about to run Alan over with the car, first Alan is standing sideways on the road, then there's a close-up of him turned 90ยบ looking straight at the cop, then a third angle shows him turning around from the initial sideways position.
Continuity mistake: When the cop is about to encounter Alan, there are two passers-by behind the car who disappear in the close-up angle.
Revealing mistake: When the monkeys are in the garden, running away, just after Judy says "Beware", they cast no shadow either on the paved entrance, nor on the grass, plus they move as if in stop-motion, instead of the perfect movement they did before.
Continuity mistake: When the spiders show up, Alan's hair is covering his right temple or not, depending on the angle. This changes back and forth.
Continuity mistake: When the hunter crashes against the supermarket wall it makes no mess - as the final wide angle reveals, yet when the kids arrive the whole place has stuff scattered all over.
Continuity mistake: When Alan is about to cry "stampede!" several books fall on the floor. After he shouts it, there's a wide angle and the books are gone.
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.