When you're just dealing w/ contestants / production team for sure.
It becomes a bit harder when it comes to an entire studio audience watching it live in advance. Are they going to require everyone in attendance to sign a non-disclosure contract to attend? I kind of expect a no on that one and almost guarantee the result will leak prior to the end of the show. Sounds like it will still be filmed that same day, though, and just in advance by a couple of hours so it won't really be that much difference that the east coast / west coast delay anyways and should be plenty easy to avoid.