And to be honest, it wasn't even that bad of a game up until the mid-point of the game and everything just blew up in a six minutes span almost entirely due to self-inflicted wounds that are easy to review and hopefully correct.
As the comment say, wrong side of the inch applied here, where if the puck on Dallas first goal is an inch off its location, it might not sneak through. Or if the three post up to then or the last second stick stopping Janmark's empty net shot are an inch different, it could have been 2-0, 3-1 even 4-1 Edmonton and then they possibly don't start doing the stupid things they did once they started chasing.
They ultimately deserved to lose that game, but play those same first 30 minutes 7 times in a series, Edmonton's likely holding a lead at the mid-point in 3 or 4 of those games and likely at least within one goal by the end of the 2nd 6 out of 7 times.