This slipup was one of the most obvious slipups I've ever seen and I'm amazed nobody caught yet. In the scene where Micheal Cain is teaching Sandra Bullock's character to "glide" and they almost get hit by the taxi, look at the background...it's a bunch of people watching the filming of the movie. You can see the police barricades and everything. This was so noticeable I started laughing when I saw it.