Candy Joe shows a film of him knocking out Doc Russo. As the beaten fighter returns to his corner one of the trainers is seen wearing a shirt with the word Rocky, instead of Doc or Doc Russo. It's because the film is actual footage of a Sugar Ray Robinson - Rocky Graziano title fight from 1952.
Candy does not answer the bell for Round 5 and Lopez is announced as the winner by Knock-out. The match is an RTD "Referee Technical Decision". It occurs when the referee decides to stop the fight between rounds because one of the boxers is unable or unwilling to continue. Therefore, Lopez should have been declared winner by Technical Knock-out.