You don't adjust completely in three days, see Calgary's 3rd period edge all season.
Those were all bad penalties, stupid roughing, two holding (not moving the feet) and a careless slash.
They could have been called for a couple other penalties as well.
The problem is much deeper than the coach.
The first line got dominated, G and TK just struggle on defense, and JVR isn't the answer.
Raffl and Couts can play defense, Voracek not so much.
Laughton needs to be demoted to the 4th line, he's Raffl without the physical edge, he simply doesn't make plays when he's on a top 9 line, he's best forechecking on the 4th line and on the PK.
Fletcher is looking for what is obvious, Goalie (unlikely), top 9 forward, and veteran defenseman.
Gudas/Hagg is a bad pairing and MacDonald/Folin is an obvious upgrade target.
They need more speed and quickness up front, they struggle with the faster teams.