Evidently, both candidates were given advanced word of a few of the questions they would receive during the forum. From the Times:
A spokesman for Mr. Warren, A. Larry Ross, said that Mr. Warren, founding pastor of Saddleback, had assured both candidates in advance that he was not going to play “gotcha” with them. He gave them some of the questions, Mr. Ross said, because he wanted to put them at ease and alleviate any concern that the forum would be a “Christian litmus-test” for president.
The issue of the “cone of silence” and McCain’s awkward (given the actual situation) description of how comfortable it was, however, remains.