Carlos Olivera: Just promise me one thing. When you get down there.
Alice: Consider it done.
As Carlos is giving his final goodbyes to Claire you can see in the background automobiles driving down the freeway. Shouldn't these roads be empty rather than having what seems to be a thriving highway?
When Alice's clone stops the lasergrid from killing the real Alice, there is a shot of the computer screen showing the disintegration of Isaacs, Dr. J. This is a reference to Jason Isaacs, who has a history of appearing in Paul W.S. Anderson movies. Anderson produced this movie, so the circle is complete.