"I just got to make some character connections," explains Whedon. "The structure of the thing was really tight and I loved it, but there were a couple of opportunities to find his voice a little bit — and some of the other characters — and make the connections so that you understood exactly why he wanted to be who he wanted to be. And progressing through the script to flesh it out a little bit."
To check out the rest of the interview, just click the image and Cap below.