BB-8 showed his comedic potential in a handful of hilarious moments in The Force Awakens, and Johnson’s comments indicate that it will go to another level in The Last Jedi.
The droid will likely once again be in the thick of things in The Last Jedi and find himself in even more sticky situations than in The Force Awakens.
So, for Johnson to compare a character like BB-8 to the work of Keaton is certainly high praise.
For the uninitiated, Buster Keaton was an actor/director who is widely regarded as one of the greatest pioneers of physical comedy.