In a new interview, Hamill said the ending would have seen Luke Skywalker surrounded by 'floating boulders' to demonstrate his use of the Force as Rey approached him on Ahch-To.
Of course, The Last Jedi begins with the revelation that Luke is no longer using the Force, which would have made it difficult to explain those floating boulders. (Helium?)
"When we were doing [The Force Awakens], Rian said, 'We might have boulders floating to show your Force emanating', so I was led to believe that I still had the Force and it was really strong in me," Hamill said.
Luke Skywalker in Star Wars: The Last Jedi
RELATED ARTICLE
What happened to Luke at the end of The Last Jedi?
"When I read [The Last Jedi] before [The Force Awakens] came out, I said 'what?!" and called JJ [Abrams] or Rian [Johnson] to say, 'Are you guys aware of this? Have you seen a cut? Is there floating boulders?'
"And they said, 'No, we caught that and we worked it all out'."
http://www.digitalspy.com/movies/st...ns-ending-luke-skywalker-the-force-last-jedi/