Beatty handed Dunaway the envelope, which contained information about the best actress award won by Emma Stone for La La Land.
Faye Dunaway has opened up about her role in the best picture envelope scandal at the Oscars, two months after the awards ceremony.
Two PwC accountants were later found to be responsible after it emerged that they had mistakenly handed Beatty and Dunaway the incorrect envelope backstage.
PwC, formerly PricewaterhouseCoopers, has been administering the Oscars voting process for 83 years and has apologised for the error.