Visible crew/equipment: When grown up Alan is running around shouting "I'm Home!" after just arriving back from the jungle, the camera pans past a grandfather clock, and you can clearly see the legs of a crewmember reflected in the glass panel of the clock, moving in time with the camera. (00:30:50)
Visible crew/equipment: In the scene with the big tarantulas, many times you can see the strings attached behind them, especially the one Peter swings the axe at. (01:24:35)
Visible crew/equipment: At the beginning when the bats come out of the fireplace and chase young Sarah out of the house, you can very plainly see the reflection of the cameraman in the door handle after the doors close. (00:14:40)
Visible crew/equipment: In the scene when the pods and vines start growing all over the lounge, there is one shot of a green vine crawling towards a carpet, and then slithering under. Watch closely, near the carpet, and you can see the wire attached to, and controlling the vine, because the light shines on it, exposing it rather well for a second. (00:48:40)
Visible crew/equipment: Near the start when the young Alan goes to open the door and there is a close up of the handle you can clearly see the reflection of the camera man. (00:12:05 - 00:15:10)
Visible crew/equipment: When the monkeys enter the cop's car there's a huge lighting screen with a bunch of tubes reflected on the left side of the car.
Visible crew/equipment: Just before the monsoon, everyone is in the attic and Judy tells Sarah that she needs to roll a 12 to win. When it cuts to Peter, you can see his tail behind him, and the wire attached to the tail is visible, holding it up and swinging it about. (01:15:35)
Visible crew/equipment: When the lion first emerges from the Jumanji, Alan tackles with it and it then jumps at him, and lands on a long carpet, and goes sliding along on the carpet, into a bedroom. The black wire used for pulling the carpet along is visible, yet best seen in slow motion. (00:28:30)
Visible crew/equipment: When the vine takes the police car into the woods, a very obvious film light is visible reflected on the back of the car.
Visible crew/equipment: When the police car gets dragged off by the vines, there are wires visible attached to the boot of the car. (01:18:00)
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.