No team is ever going to have a perfect season, 1972 Miami Dolphins aside. And they played considerably fewer games than the 82 that make up the NHL's regular season.
So fact of the matter is, sometimes you're going to play well enough and still lose. It happens. Maybe it's one single moment that costs you your chance at victory. That doesn't mean you played poorly, or were failures. Sometimes that just means you didn't win.
The Flames lost to the Rangers. They still had a good game, though.
That was ridiculously evenly played
Looking at the stat line for this game is kind of nuts.