I also think that Jackass believes everything he says, even if he changes his mind, has two conflicting claims, he believes it when he says it. I think the best thing about the whole thing is to listen to true believers "explain' this whole thing. Talk about personal fantasies!
Jackass deals in, and believes, different realities - his explainers, however, deal with single lies, not the fact, for instance, that he stood on three sides of whatever in about 3 minutes.
I rarely, anymore, pay any attention to him as it rarely makes any sense.