Clear hit from behind by Pastrnak - though, not a particularly hard one. He definitely let up some when he realized it was going to be directly into the numbers. However, he shouldn't have put the emphasis into it at the end, and that should lead to a fine. It probably won't, but it should.
Wilson's spear was bad. Sure DOPS will look at that. Pastrnak's sucker punch after the hit at the bench wasn't great, but will probably go unpunished. Wilson almost certainly hitting the linesman with some of those punches will also probably go unpunished, as it'll be tough to provide clear evidence on.
Wilson's reputation for being a dirty player is well known. Pastrnak seems to slide under the radar a lot, but he has some history of cheap shots/dirty hits.