They contradict each other. The view that they don't comes from closing your eyes and lying to yourself, because you've created a doctrine that if there's any contradiction at all, the Bible collapses, and because your faith is based on the Bible, your faith collapses.
What Jesus said and did can have authority just exactly like every other law, regulation, rule or custom does. There is authority out there, it's real and true. It's conveyed to us imperfectly, through imperfect people and imperfect writings, but we're all human and we're all made with the ability to discern what is and what is not.
Did the [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse] crow once or three times? What exactly did Jesus say about the [bless and do not curse][bless and do not curse][bless and do not curse][bless and do not curse] crowing?
How many times did Jesus clear the temple of moneychangers, once, in his final week in Jerusalem (per some gospels), or at the beginning of his ministry (per another). Does that mean that he cleared it twice, or that somebody got a detail wrong.
It doesn't matter that the detail is wrong. Everybody remembered that Jesus foretold something regarding Peter and the rooster crowing, and it happened. It doesn't matter that it was one crow or three crowing - except that the discrepancy and contradiction shows us that we can't take the text strictly literally.
If we MUST take it literally - then we MUST make these contradictions square. And they don't. So then faith must collapse because the Bible contains contradictions and errors. Or we have to lie to ourselves and say that it doesn't when it clearly does, and then just keep repeating it over and over. Or we have to start making up fables and improbable stories that aren't in the text in order to "save" its perfection.
Really, the best thing to do is to accept that it is history, with the minor issues of any written text, and to do the same thing with regard to it that we do with regard to books of law and custom - focus on the meanings and not become obsessed with the typos.