As M. Night Shyamalan fans know too well, the writer/director loves to craft an unexpected ending. He first caught audiences collectively off guard with 1999’s The Sixth Sense and has since continued his tradition with Unbreakable, Signs and Split‘s unexpected connection to the Unbreakable universe. Enter Glass, audiences will certainly go into it waiting for an M. Night Shyamalan signature twist. Per Samuel L. Jackson, the ending moviegoers will see this weekend wasn’t the original conclusion. In his words:
Article source: https://www.cinemablend.com/news/2465435/why-glass-ending-had-to-be-changed-according-to-samuel-l-jackson