There may be parts, books, etc inserted in the bible, been trying to figure that out or if discrepencies are from the translation. But as for the "true" books, perhaps including ones not cannonized, reading Daniel and Revelation and even Ezekiel, hundreds of years apart. They appear to be completely different books as well. The prophecies not related, or talking about different events. When actually seeing how they are all talking about the same thing, how the timing and pretty much EVERYTHING on them are in full harmony with eachother, I can't think of how something like that could be done so flawlessly by people who were not even alive during the same time. If you read my last post tying a lot of it together, you'll see how the last week of the 70 weeks prophecy, the entire book of revelation, then the king of the north/south, and won't list them as too much work, but Jeremiah, Joel, Isaiah, etc are all talking about this week of time and agree with eachother. But instead of being black and white to understand it, for the week for example, "week, time times and 1/2 time, 42 months, 3 and 1/2 days, 1260 days, 1290 days, middle of the week, 7 times" all of those on their own mean different things, but then the context of them all combined and when you see are talking about the same event, you get the true understanding.
There may be a few things that need to be sorted, but if all the above is not inspired of God, it's too great to be coincidence and too perfect a conspiracy to be by human minds. Just from a logical standpoint and based on this post would be my reasoning. More indepth answer is too long of a subject to type out here.