It was a cheap illusion, with a lot of acting by Derren Brown.
All they did was freeze the image on the side of the screen where the balls were, derren and the TV were on the other side of the screen still live....
and then as the numbers were read out one of his assistants swapped the balls for the correct numbers.
When the numbers had all been called they unfroze that side of the screen and picked up the full live feed again.
The bit that gives it away is that one of the swapped balls had not been placed back in the holder properly and sits about half a centimeter higher than it was in the first place.
As they unfreeze the image you can just about see the ball jump up slightly.
Not sure if anyone saw his latest advert where he says he'll reveal how he did it and he's holding a snow flake. Well that's the hint..... the screen was FROZEN!
I reckon he would have tried to play it out like he's got some serious powers or something if they didn't make the silly mistake of not putting the balls back properly.