How did this happen?

Heres a closer look at the lead-up to the mix-up and the ensuing fallout.

Error in Judgment

It may have started with a tweet… but it ended with a gasp.

The Oscar telecast was going well until PricewaterhouseCoopers accountant Brian Cullinan handed best picture presenter Warren Beattythe wrong envelope.

Each had an identical set of sealed envelopes to hand to the presenters before they waltzed into the spotlight.

Reportedly, hemay have been distracted, tweeting a photo of best actress winner Emma Stone.

(The tweet has now been deleted.

PwC did not respond to EWs interview request.)

Youre impossible, she teased.

He showed her the card.

She called outLa La Land.

Panic Button

Immediately, PwC realized the mistake.

I took the envelope and went up to the mic,Horowitz saidlater at the Governors Ball.

What else are you going to do?

The Academyissued an apologyMonday night, but Beatty was in no mood to talk.