Common mistake of lasers being visible was all over the place in the alarm systems.
The real question though is about how they used electromagnetic pulse (emp) to shut the power for about 30 seconds and the device they used. Does such a device exist that could create a emp to brown out a city the size of Las Vegas for about 30 seconds? Sounds fishy to me.
On another note...if you watch closely you can catch a glimpse of me in the movie. As Clooney and Pitt are leaving the circus and walking through the parking lot, there is a large, dark haired man in a bright blue top walking around behind them. That would be yours truly [img]/phpBB/images/smiles/icon_smile.gif[/img]