For the first time since 1987, one of the four acting winners was not present to accept his award: the late Heath Ledger
. He was also the only one of the 20 nominated actors not present at the ceremony. See more
Just before the presentation of "Best Supporting Actress" the curtain that was supposed to open to reveal the presentation screens don't open. You can then hear a stagehand from backstage yell, "We're doing it. Steve open it!" (his voice was probably picked up through Hugh Jackman's lapel mic.) See more
In Tropic Thunder, Robert Downey, Jr., ladies and gentlemen. Robert, who's an American, played an Australian playing an African American, nominated. Whereas me, I'm an Australian who played an Australian in a movie called Australia.