Many of the connections are pure guess work, but there are also answers to quite a few of the points on that site.
Firstly it is believed that different cultures found dinosaur skulls but not complete skeletons. When an artist is presented a skull and told to guess what the rest of it looks like you end up with the vast differences in dragons from legend. If you notice the head of the Chinese dragon is very similar to the head of the english dragon yet almsot everything from the neck down differs.
The same thing happened with the unicorn, the first explorer into africa sent a letter to the queen of england saying "I've seen a creature, its the size of a horse, grey in colour with a horn in the middle of its face". The court artist drew what he could from the discription and got a horse with a horn, quite different from the rhino the explorer was attempting to describe.
"Alexander the Great, when he went to India, saw a large reptile which was over 30 metres long, that the Indians kept in a cave". Good example of what most of the stories listed do, which is to have a terrible description and then try and fit dinosaur to it. A large reptile could be a snake or a crocidle, its just too vague to know.
"Look at the behemoth, which I made along with you and which feed on grass like an ox. What strength he has in his loins, what power in the muscles of his belly! His tail sways like a cedar; the sinews of his thighs are close-knit. His bones are tubes of bronze, his limbs like rods of iron. He ranks first among the works of God... Job 40:15-19
Some people say that this description is of an elephant or a hippopotamus, but they do not have tails like the thick, massive trunks of cedar trees!"
The description doesn't say its tail is the size of a cedar tree, just that is sways like one. Matches an elephant quite well...
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