Interesting! I never noticed all the advertisement done within movies until reading your blog post. Its hard to imagine how much money company and first would spend on above the line advertisement to reach to a larger audience. I think the most important aspect when it comes to advertising your own brand is to make the advertisement as enjoyable as possible. Let the advertisement be subtle or not if the advertisement is enjoyable the perception of the firm’s brand would remain to be a positive one.
When reading your blog post, it reminded me of one of my favorite advertisements, although its the opposite of subtle and not in movies but the advertisement creates a lasting impression and people who watch the advertisement would leave the video with a positive perception for the company. Enjoy.