Two Gripes...
1. Darth Vader's casual, wiggly walk. He's supposed to stride purposefully and a bit stiffly due to carrying his own life support system around with him.
2. The unnecessary close-up of Leia's cgi face. The technology isn't good enough yet. She looked like a waxwork. It would have been enough to see the stolen plans handed to a white-cloaked figure in the distance. Less is more.