I'll point out what I see was wrong then I'll note that overall I'm a loser at PLO (due to one heck of a streak at getting unlucky in big pots--If I get beat in another one by another crazy runner runner or gutshot straight by someone only drawing to that when I've got the nuts plus good redraws I'll officially go nuts) *I will also note I'm a good winner at the rest of the games I play (7 stud, Omaha H/L and holdem)* (It doesn't make sense to me to be a winner in H/L and not in omaha without a freakishly bad run of luck?)

Anyway, here we go
Mistake 1--AA23 guy didn't raise preflop
Mistake 2--AA23 guy calling a bet and a raise with only the nut low draw and a backdoor flush draw (when it's more than possible he'll get quartered) [and it's obvious AA is beat]
Mistakes 3&4--two guys calling with a wrap when a good portion of those outs make a flush--also not realizing someone else probably has similar cards killing even more outs and potentially making another quartered pot because any straight card that hits ALSO MAKES A LOW FOR SOMEONE ELSE!
Mistake 5--CP calling two allins with only an A2--I would have been the heck out of here on the flop because a lot of people chase that nut low. Too easy for him to be quartered.
Mistake 6--fourth guy calling an allin when it's pretty freaking obvious at least one (if not more) person has the same nut straight and he has no redraws.
Mistake 7 (this is out of order) K356 guy bets with only top pair and a draw with a bunch of guys acting behind him who probably have that beat.

That turn really killed you but with the $ in and entering the pot you have to call there. Way too much equity with a set and a nut flush draw. If only the jack came first...

Although equity does go way down if someone has KK... KK usually doesn't smooth call on the flop there.

I'm sure I didn't see enough mistakes though. (I'm not counting preflop calls though)