We've Got Controversy
The dealer, and most of the table, believe that Coppola said "You're good," and surrendered his hand to the dealer. Coppola believes he said "You're good, I have ace-deuce," and may have flashed his cards enough so that the player to Juanda's right was able to see them. Coppola's live-ace would have been enough for the low half of the pot.
Juanda and the rest of the table disputed whether or not Coppola declared ace-deuce but felt that it shouldn't matter because he didn't table his cards. The dealer awarded the pot to Juanda, and amidst all of angy shouting a floor supervisor was summoned. That supervisor made the same ruling, namely that Juanda should win the whole pot.
Coppola refused to concede, to the point that Jimmy Sommerfeld was summoned to the table. He listened in turn to: the dealer; Coppola; Juanda; and the table, then made his ruling.
"It's real simple," said Sommerfeld. "If you don't table your cards, you don't have a live hand. You must table your cards. The whole pot goes to John."
And with that, the crowd of onlookers gathered around the table dispersed.