Dallas Cowboys have appeared on Hard Knocks twice before: 2002 where they finished 5-11 and 2008 where they finished 9-7.....both times missing the playoffs.
"A total of 13 teams have appeared on "Hard Knocks" since the NFL training camp documentary series debuted in 2001, with the Cowboys and Bengals each having been featured on the show twice. Of those 13 teams, six went on to finish their seasons with winning records, with a few making deep playoff runs."
Not 1 team that appeared has ever made it to the Super Bowl. Typical Dallas Cowboys media hype and no performance.