How to start off a Compare&Contrast Essay?

How to start off a Compare&Contrast Essay?
I’m doing an essay on the Outsiders, book vs. movie. I don’t know how to start it off. If you ask my teacher, she won’t really say how to, but to just keep thinking. Usually, I’m good at doing introductions for essays, but she said we can’t use the words: I, me, we, us, etc.
I’ve got the rest of the essay, but the introduction is bugging me.

Compare and contrasts are the BEST kind of essay, once you get to uni it’s all research essays. I miss high school. I’m actually pretty sure I once wrote the same essay you’re working on.

Anyway, the reason your teacher is telling to keep thinking is that if you’ve got the rest of your essay done already, then the introduction should be a breeze. Take a look at your main points, your topic sentences. If you had to explain your entire essay in thirty seconds, what would you say? Your introduction is like saying to your reader, “I’m talking about this book and that movie. I’m going to say this about the book, and that about the movie, and I think they’re similar in this way but they diverge in this way.” You’re telling them what to look for in the rest of your essay.

When you’re writing on a book and the movie, a good starting point is to include a little context for them. It shows you understand why they’re important and that you know when in history they’re placed.
“‘The Outsiders’, S.E. Hinton’s coming-of-age novel about two rival socio-economic groups, was published in 1967 when the author was just 18. In 1983, Francis Ford Coppola directed a film adaptation of the same name.” (And then you go on to say ‘While the book did this, conversely, the film did that. While both share (this characteristic) only one of them did THIS.”

Don’t go into too much detail, that’s up to the rest of your essay.