Bell Hooks clearly has a lot of experience critically examining media and how it represents minority groups, and I enjoyed listening to her thoughts on so many pop culture institutions. She leads by example by teaching us to always examine everything we are seeing - for example, pointing out that the thief in one movie was depicted as a dark-skinned man, even though the book it is based on did not specify his race. Things like these make me realize I should approach every piece of media I consume for any prejudices or possible discriminations present.
One strategy she uses to analyze pop culture is her own experience. She notes how her Grandma often verbally mocked her dark sister, and how this led her to realize that things weren't right in the way a lot of society treated race and how pop culture sometimes only entrenches these stereotypes and feelings.
When hooks talks about being enlightened witnesses, I think she means we need to keep in mind their situations and struggles through everyday life and how sometimes, movies and TV shows only exacerbate these problems. For example, when the hero of a movie uses the word 'gay' as a derogative but is otherwise a likeable and attractive character, the audience is much more likely to glaze over the use and even begin to think it's acceptable. They will probably be more likely to use it themselves. I always think of a South Park example - Stan and Kyle, the two main characters in my mind, are very normal, likeable boys - but the writers have them consistently and very casually use gay and fag. When a young audience sees the hero of the show who you're supposed to like say these things, they must automatically assume most people do this and that it's acceptable - something I think is very bad. It's surprising because I know the creators of South Park are quite liberal and otherwise gay-friendly, but I suppose that's another story.
In a class on queer cinema, an enlightened witness would bring an open mind, a good understanding of previous queer representations and how they have evolved over the decades, and most of all an empathetic mind to how important GLBT representations are because of how much they affect the opinions on non-queer everyday people.