It was acted an transmitted live on BBC 4 so I assume someone must have edited it up if only some of the errors are in it.

It was also quite a bit shorter on the night than the timeslot it was allocated, so one assumes *something* a bit odd happened to it -- quite possibly in the ending departement -- tho' I admit I was only very very vaguely watching. Like 'Oh, it's over the in the corner with the sound muted' levels of vague.