Engadget - When an NFL team builds a brand new stadium, it's usually packed with the latest tech to insure a flashy introduction. The Dallas Cowboys have absurdly large video screens over the field and the Arizona Cardinals can move the entire playing surface outdoors to soak up some rays. This season, the San Francisco 49ers moved from Candlestick Park to Levi's Stadium: the first of the NFL's venues to be LEED certified, thanks in part a solar collection system that will power all ten home games. To enhance the fan experience, there's a smartphone app that sorts tickets, concessions and wrangles instant replay. In fact, you can use it to scout the line at the nearest beer cart or place an order in advance for pickup or seat-side delivery. As you might expect, this past weekend's first game action put the new system to the test, and as is common with most new large-scale tech, fans felt the bugs pretty quickly.