The Making of Deadpool & Wolverine, it was revealed that there was an initial idea to show that Deadpool ( Ryan Reynolds) had been in the background of the MCU the entire time, with all of his appearances being left on the cutting room floor.

While the ending of Deadpool & Wolverine may have left its viewers in complete awe, only a few people know that Blake Lively proposed a significant twist in the conclusion. While its unique brand of humor and well-crafted cameos garnered much praise from the audience,

Ryan Reynolds and Shawn Levy revealed on the “Deadpool & Wolverine” director’s commentary (via Games Radar) that the film’s ending changed thanks to a note from Blake Lively and less than two days of reshoots.

Marvel fans have Blake Lively to thank for Deadpool & Wolverine's killer ending. Ryan Reynolds and Shawn Levy revealed on the Deadpool & Wolverine director’s commentary that Lively's reaction to the movie caused them to reshoot certain scenes.