This year's victor envelopes feature much bigger print on the outside - a change that was no doubt influenced by last year's snafu when La La Land was incorrectly announced as the victor of Best Picture (Moonlight took home the trophy).
Warren came on stage after the wrong victor was announced to explain what happened.
And hey, accepting Best Picture twice?
Instead, it's now been announced, the Best Actress award will be presented by Jennifer Lawrence and Jodie Foster, with Jane Fonda and Meryl Streep presenting the Best Actor award.
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He was later signed by Oakland - and is now still under contract with Raiders organization - but hasn't played since 2015. Since joining the Raiders, the Kansas City, Missouri native has been detained and investigated by police four more times.
But Warren Beatty made doubly certain he was carrying the right envelope, quizzing the PwC representative before walking on stage.
Last year's PwC accountants, Brian Cullinan and Martha Ruiz, were replaced by Rick Rosas and Kimberly Bourdon. "This is Moonlight, the best picture".
But this time, there would be no blunders.
It turned out that Beatty and Dunaway had been given an envelope containing the name of "La La Land" star Emma Stone, the victor for Best Actress.
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With the nerves jangling, most quickly confirmed they were, but for the man who should have possibly been more anxious, it was a chance to joke. Where. Is. That. Card?' Hopefully no one will be confused as to which envelope they've been handed.
She made a point of highlighting the bigger, supposedly foolproof font, but Beatty reacted only with: 'Really?' according to USA Today.
Dunaway went on to say that last year's error had been on her mind ever since.
Warren Beatty has been nominated for fourteen Academy Awards - four for Best Actor, four for Best Picture, two for Best Director, three for Original Screenplay, and one for Adapted Screenplay - winning Best Director for Reds (1981).
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"Presenting is lovelier the second time around", Dunaway added, after they both received a standing ovation.