As always, he tells some of the truth, but exaggerates a lot.
The Powerlifting meet I can find for him is 1993 California ADFPA on 3/13/1993. He won the #242 class with a #650 Squat, #705 Deadlift, and a #452 Bench.
http://freepdfhosting.com/9bf6f248cd.pdf .
Here's a Powerlifting USA page with the #242 rankings for 3/93 through 2/94 -
O'hearn at #94 in the squat, not ranked on the bench, #23 deadlift, and #76 for total.
Looks like someone transposed the numbers on that page too, #1708, should probably be #1807 which would make him a lower 30's ranked on total lifter.
O'hearn mentions going against Bull Stewart here -
http://www.instagram.com/p/BKYwmo3AWOG/?taken-by=mikeohearn . Anyone have that issue?
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The strongman contest he won was the Iron Warrior Decathlon of Strength -
http://www.marunde-muscle.com/forum/showthread.php?t=20085 . These are a small California based contest that had something to do with Metro Flex Gym of Long Beach. It is a medley of OL, Strongman, and Power Lifting lifts.
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On the Judo stuff, this is what I dug up years ago -
http://www.getbig.com/boards/index.php?topic=589034.msg8349204#msg8349204 .
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On the Martial Arts Hall of Fame stuff, it's true, but a humanitarian award. It wasn't for fighting -
http://www.instagram.com/p/BC03SwNKyNx/?taken-by=mikeohearn&hl=en .