When I started watching hockey around 1995, players did not go into the boards the way they do now. Players were allowed to hit each other and they knew this. When I guy went into the corners or anywhere along the boards, they knew to protect themselves. They didn't skate along with someone and then turn their back as someone was bearing down on them because they knew the would get laid out.
Now the refs have become bailout agents. If a guy is pursuing the puck, the location of their opponent doesn't matter. All you have to do is turn your back to them at the last moment and all of a sudden the guy pursuing you has the duty to ease off and let you have the puck. If he hits you, despite the fact that your turned your back on him to leave yourself vulnerable, he gets the 2 minutes or 5 minutes and his team suffers.
I don't recall seeing as many nasty hits from behind in the corners than as I do now...weird since it was legal back then but it isn't now. Maybe cause the players knew not turn their backs at oncoming players so they can draw a penalty?
On the Rinaldo hit, it was sort of an in between the side and the back, in my humble opinion. Viscous? No. Worth a penalty? No. It was Jovanovski turning into the boards and letting the refs bail him out.
Anyway, it's now 5-0 Flyers. They're hitting their stride.