Sounds like it could have been, according to Variety:

Brian Cullinan, one of the two PriceWaterhouseCoopers partners who handled the Oscar envelopes on Sunday night, was tweeting photos from backstage minutes before he handed Warren Beatty the wrong Best Picture envelope.

Cullinan has worked on the Oscars for four years. He handed presenters the wrong envelope, one that had the name of best actress winner Emma Stone instead of the producers of “Moonlight,” the film that ultimately took the top honor.

It turns out that the mistake may have been made because Cullinan, a managing partner at the firm and one of the accountants tasked with making sure the right names get read out on Oscar night, was busy tweeting about the show instead of carefully overseeing the envelopes, according to two knowledgeable insiders.

As David Weigel would put it, whoa, if true.