I don't think they showed any of it, at least I didn't see it if they did. I wouldn't bet money that they didn't record it though. The comment refers to his post show interview. He told the interviewer he regularly visited the toilets for a tension easing fiddle. He said that Lawson used to cover himself in a doona but he just got on with it and didn't worry about the cameras.
How gross is that, with all of the things he could have talked about, that is what he chose to disclose on his winners interview. His mummy and sisters must be so proud.