Van Pelt's rifle SPOILER
At the end of the film, Alan wins and everything from Jumanji is sucked back into the game. But Van Pelt's rifle wasn't from Jumanji. Therefore the bullet wasn't either. Which means that Van Pelt killed Alan and Sara before getting sucked back in and the ending is a hallucination of one of the characters as they lay dying.
SorryNotSorry if this has been posted before.