When RKO obtained the film for their "This Is America" series, they added about four minutes of new material to the beginning of the film, making the short 16 minutes long instead of the original 12 minutes. The opening four minutes with boxing historian Nat Fleischer is markedly different from the rest of the film as if features footage from different boxing matches. The opening was also modified with the credits appearing in different order and the music for the opening was also changed. The majority of the picture is the same until the end. In the last sequence when the knock out happens, the narration is once again changes. Kubrick's original cut features Douglas Edwards talking about personal sacrifice and success. The extended RKO cut removes this portion of the narration and adds new one with Nat Fleischer to better match the opening segment - this narration is about how this fight will go down into the record books. The music at the end was also changed - Gerald Fried's finale cue was moved earlier to match the beginning of the new narration, but because it starts sooner, it doesn't line up with the ending. Thus the new end title card (which adds This is America to the bottom of the card) plays in silence.
