In his autobiography, caroll spinney gave detailed information about how he performed all of his characters. however, he never mentioned anything about how he was able to see what he was doing whne he performed bruno. was there a really tiny monitor inside the costume, or could there have been a small hole inside the eyebrows, or was there some other way? or was he completely blinded inside the character? I believe that he could see inside the costume, since bruno has rollerskated, and bruno even carried oscar while rollerskating. since caroll spinney usually performed two characters at once (inside the bruno suit and operating the oscar puppet through a hole between brunos stomache and the trash can), he probably needed to see what he was doing as oscar.