Unfortunately, that's not the first time the Canadian anthem has been boo'ed at a hockey game in the US. It was nice to see the Oilers fans do the right thing (and winning the series was a nice reward as well).

There are 14 Canadians on the San Jose roster:
http://sports.espn.go.com/nhl/teams/roster?team=san
Almost half the team. I wonder if their fans even had a clue.