I noticed the spots that ran during the Olympics had the championship sign digitally removed.
You'd think that if there was one spot in Chicago that would've been kept up post-electricity, it would've been Wrigley Field. After all, they didn't have stadium lights until 1988. You'd think the Cubs faithful would maintain the shrine and keep playing games there.
Maybe "high-concept" sci-fi shows should just avoid baseball stadiums altogether. Remember "Flash Forward"?
Remember the concept...in the present day, everyone on Earth blacks out at the same time? At the end of the first episode, surveillance video from "a baseball stadium in Detroit" shows someone moving around while everyone else was out of it. However, the stadium shown was clearly not Comerica Park (the actual baseball stadium in Detroit). That took me right out of the episode and I lost interest in the series.