There also the story of David and Goliath. Does he David really kill Goliath because Saul doesn't seam to know who he is and in one part of the Bible indicates it's not David and even names the other guy. Also Saul offers his daughter to whom ever kills Goliath yet after David does the daughter issue doesn't come up till later when David is offered the daughter yet for another reason.
Then a real telling part of the story is after David supposedly kills Goliath he goes off to Jerusalem, but wait Jerusalem hasn't been conquered by David and is still under the control of the Jebusites. But it doesn't end there.
If one looks at Goliath's armor it not armor of a phillistine but of a Greek hoplite soldier of a few hundred years later. In fact some say this kind of armor made in this fashion didn't even exist during this timeline for they lacked the technology.