Oscar Envelope Handler Brian Cullinan Under Fire for Best Picture Flub, Caught Tweeting Minutes Before Error

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The fallout continues after the biggest flub in Oscar history.

And it looks like Brian Cullinan, a PricewaterhouseCoopers partner who handed presenters Warren Beatty and Faye Dunaway the wrong envelope on Sunday night -- when La La Land was initially mistakenly awarded the Best Picture Oscar as opposed to the actual winner, Moonlight -- is paying the price.

Following the incident, paparazzi has been staked outside of 57-year-old Cullinan's Malibu, California, home. In addition, his social media habits have now been called into question. Just three minutes before the Best Picture Oscar was announced, Cullinan tweeted a photo of Emma Stone holding her Best Actress Oscar backstage, leading some to speculate he was distracted before the error.

NEWS: How Faye Dunaway and Warren Beatty Ended Up With the Wrong Envelope, Fully Explained!

The tweet has since been deleted, though not before it was captured in screen shots.

The Academy's official policy is that "there is no photography inside the Dolby theater at any time," but it's unclear if Cullinan is covered by that policy.

Although, according to People, Cullinan was actually asked not to tweet or use social media during the show. "He was fine to tweet before he arrived at the red carpet, but once he was under the auspices of the Oscar night job, that was to be his only focus," a source tells the magazine. "Tweeting right before the Best Picture category was announced was not something that should have happened."

ET spoke to Cullinan on Sunday, when he reinforced his and fellow partner Martha Ruiz's important role during the night. "We stand backstage and we hand the envelope to the presenter right before they walk out," he said.

In an updated statement from PwC on Monday, the accounting firm took full responsibility for the mistake, and called out Cullinan for not only handing out the wrong envelope, but for him and Ruiz not acting quickly enough once the mistake was made.

"PwC Partner Brian Cullinan mistakenly handed the back-up envelope for Actress in a Leading Role instead of the envelope for Best Picture to presenters Warren Beatty and Faye Dunaway," the statement obtained by ET reads. "Once the error occurred, protocols for correcting it were not followed through quickly enough by Mr. Cullinan or his partner."

"We are deeply sorry for the disappointment suffered by the cast and crew of La La Land and Moonlight," the statement continues. "We sincerely apologize to Warren Beatty, Faye Dunaway, Jimmy Kimmel, ABC, and the Academy, none of whom was at fault for last night's errors. We wish to extend our deepest gratitude to each of them for the graciousness they displayed during such a difficult moment. For the past 83 years, the Academy has entrusted PwC with the integrity of the awards process during the ceremony, and last night we failed the Academy."

Cullinan, who's been a part of the Oscar balloting team since 2014, has yet to comment on the blunder. It is unclear whether he'll be reprimanded following the incident.

WATCH: EXCLUSIVE -- 'La La Land' Producer Jordan Horowitz Reacts to 'Shocking' Best Picture Flub

On Monday, Oscars host Jimmy Kimmel opened up about the awkward fiasco from his perspective that night, and managed to find some humor in the situation.

"You know it's a strange night when the word 'envelope' is trending on Twitter," he joked.

"I'm standing there like an idiot, feeling bad for these guys, but also trying really hard not to laugh, to be honest," he later added about attempting to smooth over the mix-up.

Watch below:

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