Well, I just watched and it is clear not one of the beauties ever think the judges are looking at anything but their looks.The judges use a lot of hidden cameras to do the spying, and the beauties seem dumb enough in most cases not to notice they exist.
There a marked difference in their behavior between when they know they are being filmed and when they are not aware of it.
However, there is a great difference between them all while being filmed by hidden cameras even then. Some, I automatically dislike just from their interviews, only to show some redeeming feature while being spied. Others grated on my nerves all the time.
The first to be let go was one of them. And even when they started to play back the hidden video she tried lying about her actions even with the evidence to show what she did wrong REPEATEDLY.