My colleague Brian Nehring, a sharp-eyed “Prison Break” fan, spotted something unusual on this week’s episode: the names of St. Louis Blues players in the address book of Gretchen’s (Jodi Lyn O’Keefe) phone. What was up? Studying the opening credits offered an answer. The episode was written by Christian Trokey, who grew up in St. Charles and got away with slipping in a shout-out to a hometown team.