Oscars stage manager: 'Accountants need to pay attention'
Media playback is unsupported on your device
Video

Oscars insider on how gaffe unfolded

Oscars stage manager Debbie Williams says the accountants in charge of the Oscar envelopes "need to pay attention" after it emerged that Brian Cullinan tweeted a picture of Emma Stone backstage, just before Sunday's mix-up.

From Radio 4's PM.