Fish, Cow, Elvis...?!

Do you think YOU can solve this puzzle? Go see the first three clues, the fourth clue and the final clue. Any ideas?

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Puzzle Fantastica #1 was too hard Puzzle Fantastica #2 was too easy Puzzle Fantastica #3 is ... As before, each of these three clues are held together by a common answer. Start the solution in the comments area, and good luck.
"On Evidence" (and in reference to the on-going, yet still unsolved Puzzle Fantastica #1)
This is not a clue. More a hint, mostly.
In a countdown from just one of us, this one isn't just from one half of the World's Fair; it's from both of us.

Isn't it a cowfish?

And was that the world's fair where they had the cow with the window into it's stomach?