I think the problem with the Pilate stuff is not that it's inaccurate to the Gospels, but, rather, that the Gospels themselves are inaccurate in that respect. After all, how are Matthew, Mark. Luke, and John (or the people who wrote under their names) going to know how Pilate felt? The Gospel in question implies that Pilate wanted to release Jesus under his prisoner release program, but if you just read his speech, there are multiple ways to interpret it. And how do they know that his wife sent him a note or what it said?