I wonder if that phone "breaking up" when "the camel" is asked about was planned by Oz and Tough Pigs before the interview (as in, they expected that to happen) or if that's his way of avoiding things he doesn't want to talk about (maybe the documentary sheds some light on that, Tough Pigs clearly saw it already but most of us haven't) and did so unexpectedly.
Of course he does that when Harvey Kneeslapper is brought up, as if he doesn't like talking about him, but then when TP said they don't have to Oz did talk about the character.