The Dutch, who missed out on Euro 2016 qualification following a fourth-place finish in Group A, downed Chris Coleman's side with Arjen Robben netting twice.
However, despite sealing a morale-lifting victory, Blind was more interested at highlighting the areas his side could improve upon.
"It was quite annoying that we have had to weather two goals from set-pieces,'' Blind told SBS6 .
"We just have to pay attention. In qualifying we conceded three or four [goals] from corners or free-kicks. That should really be much better.
"We started well, but fell asleep again and had our backs to the situation. When you have the right focus you do not miss the overall picture.
"We had to come back into the Wales game, while we could have been 3-1 or 4-1 ahead."
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