Just undisciplined play all around.
Not looking for excuses here or anything. But given the matchup tonight and the relative youth on this Pens roster, I think they're doing a decent job. They don't look intimidated at all. They need to clean it up a little bit, but with young teams like this, you're going to make mistakes and get sloppy from time to time against good teams like this.
I'd like to see them start pressing a little bit more on offense and just start getting the puck on net.