Hockey is just like any other sport. Calls change momentum and flow of the game. They do not directly affect the goals by each team but it puts teams in position to be successful, especially when calls continue to go there way.
Now to Washington's credit, they took advantage of the calls and skated well all night.
For AO, he is an amazing player but as complete *edit*. Late hits and leaving his feet every game and never getting called for anyone. He will get what is coming to him sooner or later so don't go crying when it does happen.