Oh, What a (Double) Dummy I've Been!

Somebody made a mistake on every hand during their team match. As they described their play afterward (in some order):

Adam:
"After the referee opened 1C, I decided 7C looked like the best grand."
"I corrected to 7NT, not realizing my partner had two voids."
"I doubled the colonel's 7C sac instead of finding the making grand slam."
"I ended up playing 2H in a 4-3 fit rather than letting my partner try 2S."
"The colonel found the only lead that sets my heart sac two."
"The protest singer's 3NT rates to be awful, so I didn't even consider bidding 4D."

Joe:
"5C seemed like a decent try, but it turns out that 4S goes down on good defense and the referee found a good double."
"I decided to sac in 6NT out of desperation, but it turns out the colonel's king drops, and I never get to cash my ace, and..."
"I mixed up whether we were playing 1430 or 0314, so we ended up in 7NT missing an ace. And of course the referee found a double with his spade holding."
"It looked like a misfit, so I thought defending 3C might be best."
"With 18 points, how could I not double and defend 6Hxx?"

Oliver:
"How was I supposed to know that we needed to sac against 6S with 22 points between us?"
"I figured my 7 card heart suit was better than the 6-2 fit and made a part score."
"I made a natural looking low club lead against 3NT"

Roger:
"After his heart preempt, it seemed like 6H was a good sac, but it went down one too many."
"I decided to open 1C, and after 1D from my partner and a heart overcall, the auction went 2C-2D-3C-3D, and I passed the misfit."
"I led my partner's club suit against their heart game."
"I misunderstood Batman's splinter in clubs, so we ended up in 7D."
"The protest singer bid diamonds on the way to reaching 3NT, so I led one through his presumed strength."

At the other table, every board reached the optimal result.

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