One of the more touching on-screen relationships is that between C-3PO and R2-D2, two robots who appear in the “Star Wars” films. The actors behind the droids got on less well. “He was in a box he couldn’t do anything with,” Anthony Daniels dismissively said of Kenny Baker, the man who played the part of R2-D2. “Rude to everyone”, was Baker’s verdict on his fellow actor.