Anthony Perkins
It was interesting to read that Anthony Perkins was so lauded at the time for his performance in this movie. Apparently he was referred to as the next James Dean (I can't see that at all). Unfortunately he is totally typecast to me, he will always be Norman Bates. I kept waiting for him to do something creepy.
On another note, I knew I recognized Peter Mark Richman, who played Gard, but I wasn't familiar with any of hit movie roles. Then it hit me where I'd seen him - he played Chrissy's dad in a few episodes of Three's Company!