Rian Johnson asked J.J. Abrams to change the ending to 'Star Wars: The Force Awakens'

"Yes … The big [favor] was, I asked if R2 could come with Rey, and if BB-8 could stay behind with the Resistance,” Johnson says. “Originally it was BB-8 who went with Rey, which makes sense for the story in a way. But I asked, ‘Can you do me this solid and switch the droids?’”

[Collider]