The Magpies were smashed 5-0 by Pep Guardiola's City at the Etihad on Sunday.
Howe said after the loss: "The second and third goals, the two set-plays were disappointing from our perspective. Two corners, we're kicking ourselves.
"We had a good spell after the two subs. We had good chances to score. I'm disappointed with the last few minutes, it puts a different view on the game.
"We had some good passages of play. We tried to be positive. You can't make individual mistakes here. If you do that you'll concede - and we did. Those small details matter and they punished us. We could have defended both corners better.
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