I downloaded and listened to one of the hour 'on demand' segments to see how they did this.
Willie got people to ring in and just talk sport... discuss anything about any sport, no subject given. Once the conversation was over they played an audio of a try being converted by Dan Carter. So I think it's down to Willie and the guy on the desk as to wether you get a yay or a nay.
So that's me out

... I can't talk sport to save my life! Movies, cars, comics, house renovation, gadgets, food, Science fiction, even girls.... But sport!!!
So good luck to all who ring in, make it a goody and get it between the posts. I will still probably listen in, maybe even learn a thing or two
My lack of sporting knowledge and enthusiasm aside, I've just posted a comp on the main page to win Sevens tickets if you are interested:
http://www.insiderunning.com/