referees
To me, this game seem to be a bit too much for these referees.
Both teams have gone away from blatant hooking and interference calls. Then, suddendly referees do call a penalty despite a similar situation was ignored earlier. This applies to both teams.
Regarding the end of the period, I found Komarov-only penalty really odd, as well as the situation where Vehanen was interfered by a Czech player and no penalty.
Refs will have a handful in the coming two periods. I hope they will manage that...