On the question of the stacking of the audience by Catholics, the following interesting comment by mitchgarside is reproduced from Pharyngula:

I can shed a little light on the audience, I’m a politically involved uni student in Aus and I heard about this from a few contacts: First some context, the show Q&A is on the ABC, a publicly funded channel, and is principally a political show that attempts to find real balance by having the best of all sides involved (not like the faux balance of many news programs, especially in the US). Hence the audiences are vetted by political leaning to attempt to produce a balanced crowd of right and left leaning, the way they do this is by asking which party you support/vote for when you apply to be in the audience.

This week the Catholic groups on campus discussed plans to stack out Dawkins appearance by applying as both Coalition voters (which would be true, they are our conservatives, yet still closer to the Democrats really, heh) and also as Green party voters (the most left wing party that has seats in Australian Parliament). So they managed to stack out both sides of the audience.

Bearing false witness being a sin doesn’t seem to have come across in this plan.