Going for the stick, got the knee instead because of Vanek's positioning. It was a 2 minute penalty, but nothing else. It's not a dirty play.
If you want dirty plays, let's talk about the hand whacks that players like Gionta and Larsson perform every night that are at least waist high while someone is skating by them. They surely aren't going for the sticks right there.
As for the Boychuk incident, it's an unfortunate play where Eichel was trying to maneuver himself away from Boychuk. Boychuk read it and played the body. It stinks Eichel went head-first into the boards, but all the players on the ice knew it wasn't intentional to drive him head first. Eichel took the risk and got caught. It's done and over with and the penalty in the game was enough.
Time to move on.