Dan Campbell made his thoughts clear after the Detroit Lions lost to the Green Bay Packers on Sunday. The Week 1 matchup saw the revamped Packers face the defending NFC North champions in a game decided early, with Green Bay leading 17-3 at halftime.The Lions had a disappointing afternoon, finishing with 246 total yards compared to 266 for the Packers. Detroit was penalized seven times for 40 yards and committed one turnover despite holding the ball for 35:25. The Lions couldn’t capitalize, and the Packers exploited their mistakes to secure a 27-13 win at Lambeau Field.Amid criticism from fans and analysts, Dan Campbell said the scrutiny reflects how far his team has come."No, because that’s where the standards are at now .. That means we've risen above what we were at one time," Campbell said, per Dave Birkett on X.Quarterback Jared Goff struggled to get going. He completed 31 of 39 passes for 225 yards and one touchdown but was intercepted once and sacked four times in a performance that raised eyebrows among Lions fans.Jordan Love, meanwhile, went 16 of 22 for 188 yards, two touchdowns and a passer rating of 128.6. It was a dominant showing for the Packers, while the Lions opened the season with more questions than answers.Dan Campbell warned players about mistakes during preseasonAfter losing the Hall of Fame Game against the LA Chargers, Dan Campbell was sharply critical of his team. Following the 34-7 defeat, he told players they could lose roster spots over poor performances and urged the team to learn from its mistakes."You want to win the game. You also want to play really well, you know, and we didn't do that. So that's the frustrating part of it, but like I said, we're going to learn from it."We're going to be able to coach off of this tape and help some of these guys get better, and that'll serve us well. And I would expect us to play much better next week, these guys that played in this game."The Lions will face the Chicago Bears, who also lost their season opener, in Week 2 before meeting another Super Bowl hopeful, the Baltimore Ravens.