6 clues you probably missed that hinted at the huge twist in 'Split'

Warning: There are massive spoilers ahead for "Split."

M. Night Shyalaman's horror thriller "Split" wowed audiences at the box office opening weekend. One reason for the success may have been the giant reveal at the movie's end. Bruce Willis pops up, linking the film to Shyamalan's previous 2000 thriller "Unbreakable."

If you were taken aback by the reveal that "Split" was a supervillain origin story, there were a lot of little clues along the way that hinted the two films were connected.

While some of them would have been difficult to notice upon a first view, fans picked up on several hints sprinkled across the film. And then there's an obvious one that was hidden in plain sight that big Shyamalan fans should have seen a mile away.

Keep reading to see several hints in "Split" that connected the film to "Unbreakable" before the big reveal.