The problem revolved around the 3♥ bid which was not alerted. Now under EBU regulations a 3♥ trial bid is not alertable if it shows at least three cards. So why was there no alert? Simple: E/W stated that they play it to show at least three cards!
The TD asked West why he bid 3♥. He said he had to invent a bid because there was no reasonable alternative. 3♠ would be competitive, double would be for penalties. What other call was there? The TD asked if they had had this problem before and the pair - who were very experienced though not top class - said it had not occurred and the problem had not occurred to them.
Incidentally: a historical note: when I was young, 3♠ would have been a game try. As more and more people shifted to playing it competitive, a large proportion started playing double as a game try. I do! There is a minority who play double as a game try only if there is no bid between the opponent's bid and 3 of the agreed suit, the so-called "Maximal double". That had a certain vogue, but is now very rare. Presumably such players would play 3♥ here as a random game try which would be alertable. Anyway, this pair apparently were not playing this.
North - who was a very good player - pointed out that his partner asked for a club on the diamond lead. Since he counted declarer for three or more hearts, he "knew" his partner had at least three clubs so did not underlead the ace to beat the contract. He felt he might have if he had known 3♥ could be on a doubleton.
What do you think?

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P P
1♠ 2♦ 2♠ 3♦
3♥ P 3♠ P
P P
Result:
3♠ = /W
NS -140
Lead: ♦A
Trick 2: ♣A