When Ian Lee was doing his piece from the camera run, the HMs were doing their in the limelight task and a member of the crew was in the house, standing behind them all, and at one point held up a white placard.......strange.

I saw this, there was also extra people I in the audience....

I assume they organise the props and stuff... Negates that feeling of being isolated that all the HM's bang on about.

It doesn't surprise me one bit.
Ever since the Jedward wedding re-shoot you really do have to take any task as fully set up and rehearsed.