This is a YouTube video created by Wab Kinew, in which he talks about the common stereotypes Canadians have about the Aboriginal population.
I believe this is a video which would be good in opening up discussions for common stereotypes some may have of Aboriginals. Depending on the students you have in your class, you could show students this video. Sharing this video could be used to open up a very honest discussion, and clarify and discuss these misudnerstandings before proceeding.
The video can be watched, here.