Corey Haim was among those absent from the montage. He was also left out of last month's tribute during the Screen Actors Guild Awards.
The troubled 38-year-old died of pneumonia last March. Haim was an '80s icon, best known for films such as "Lucas," "The Lost Boys" and "License to Drive."
The Oscars also didn't remember Peter Graves, who died of a heart attack last year at 83 years old. Graves starred in more than 70 films, TV movies and TV series, including "Mission: Impossible."