Ehrman took Pete to task on the issue of theological presuppositions. The issue is the question of ultimate authorities. On what basis should the Scriptures be believed? If they are from God, then they ought to be trusted on their own authority.
By no means. For believers perceive in Scripture: "the heavenliness of the matter, the efficacy of the doctrine, the majesty of the style, the consent of all the parts, the scope of the whole..." (WCF 1:V)
Ehrman appears to posit a sophisticated version of the telephone game. Although he and Pete broadly agree that the gospels were written some decades after the life of Christ, he holds that the stories contained therein were passed down from person to person.
Although Ehrman repeatedly mentioned "hundreds of contradictions" in the gospel accounts, he actually only discussed one, namely the account of Judas' death in Matthew and Acts. This was perhaps the most disappointing aspect of the debate.
Ehrman's recent views on this (found in his monograph "How Jesus Became God") are an interesting development from his earlier position. He acknowledged that *all* the gospels portray Jesus as divine, yet contrasts Johannine sayings of Jesus with the synoptics