I just find it odd that they put it out there.
They KNEW Live Feed was on, director of BB said in the editing/screen room, there is a box on screen whenever they are live and being broadcasted. So they knew we could see what we were seeing. So i find it more bizzare. They clearly all knew they were on air.
PLUS, live feed is on a delay, so if they wanted to hide it, they easily could have.
Makes no sense. Only reasonings i can think:
1. BB wanted to show us how they prepare for the final night for some reason
2. Someone was sacked, and managed to make all those people not intervene when doing this. Probably held them at gunpoint
Seriously, no other explanations, they can't have been that stupid.