I'd be delighted to share some examples. I didn't last time because Mike specifically requested that I give none.
What does the bible believe in that's been disproven... let's see, top of my head, how about unicorns? dragons? global floods? demons causing disease? that sort of thing?
Dinosaurs existed for several million years, yet don't even score a cameo in genesis, the brachiosaurus is rather hard to overlook. Nor are the various ice ages sweeping across the earth important enough to devote a line to. In fact out of 4 billion years of Earth's history and 13 billion years of the Universe's history the bible records maybe a few thousand if it's lucky.
The bible contains not one mention of things which could not have been known at the time... it neglects germ theory or rather flat out contradicts it, not a mention of the other planets of the solar system or the structure of the atom. In fact it contains precisely the same amount of knowledge you would expect from pre-AD middle-eastern shepherders, which surprisingly enough is the group who wrote it.
If God wrote or even edited this book he feigns ignorance beautifully for an omniscient being.
As for the question of what in the old testament is false I scarcely know where to begin, perhaps a better question would be to ask what in the old testament is historically true.
"King David" for example never scored a single mention in all of history, not only that but during his supposed time period canaanite culture in the valleys of palestine continued peacefully and uninterupted... the story that this growing israelite empire took them over is just that, a story.
Then his son Solomon shared an equally ignoble fate of leaving absolutely no supporting evidence. It's well described by this scholar, a defendent of the israelite empire:
"Solomon ... in the eyes of Israelite historians, marked the apex of Israelite achievement. Curiously, no reference to him or his father David, or their empire in a non-Israelite source is known ... " (Isserlin, The Israelites, p72)
Nor is there any evidence for Moses or vast plagues sweeping Egypt. Then again those Egyptians were so damn heretical that they pretended the flood that "killed them all" never happened and continued on perfectly content in their civilisation.
As for my conjecture, I just said that the bible could prompt conjecture... weren't you listening? Also I said it was mythology, not false... it's certainly possible that some of the events may be true but the book itself is not historical proof of anything.
Pheewf, how much more do you want?
Michael.