You can't blame the coach on that one, I am sure he told his players that, it was the players fault, they fell asleep.
As the analysts have said, switching is second nature and done in practice everyday but in crucial moments, some just zone out or focus on their man.
I mean out of all the Blazers on the court, I am 110% sure Mchale told them Lillard was the most dangerous (he has done it over and over again all season long) and Harden should have switched off there but his defense have been questionable all year so I'd easily put the blame on him.
"stay with your guy" - mchale
plus why the shit would you have harden out there anyway. ridiculous.