This article seems to answer "what happened" Feb 27, 2017 7:00:44 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by CrepedCrusader on Feb 27, 2017 7:00:44 GMT www.bustle.com/p/how-did-the-wrong-best-picture-envelope-end-up-being-read-at-the-oscars-dont-blame-warren-faye-40872Basically there are two sets of each winning envelope. The envelope Beatty had was indeed for Best Actress in a Leading Role, as evidenced by screen grabs. How exactly a duplicate Best Actress envelope got into Beatty's hands is still up for debate.
This article seems to answer "what happened" Feb 27, 2017 8:23:00 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by agentblue on Feb 27, 2017 8:23:00 GMT I assume they got the briefcases mixed up.